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Posted: 5/29/2016 11:39:36 PM EDT
[#1]
Thanks SkilletUSMC!
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Posted: 5/30/2016 2:42:47 PM EDT
[#2]
- Clint |
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Posted: 6/2/2016 9:24:04 PM EDT
[#3]
So... Who's down for a national BumpSAW meet-up?
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Posted: 6/2/2016 9:45:05 PM EDT
[#4]
Cool. Thanks.
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Posted: 6/3/2016 1:57:59 AM EDT
[#5]
Quote HistoryQuoted:
So... Who's down for a national BumpSAW meet-up? Will it be in Washington State? I have 30,000 air miles 
- Clint |
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Posted: 6/3/2016 2:13:12 AM EDT
[#6]
Quote HistoryQuoted:
Will it be in Washington State? I have 30,000 air miles
- Clint Quote HistoryQuoted:
Quoted:
So... Who's down for a national BumpSAW meet-up? Will it be in Washington State? I have 30,000 air miles
- Clint It can be, but I'm up for "centrally located" too. |
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Posted: 6/3/2016 10:25:48 AM EDT
[#7]
Ok, I'm finally putting my build together on this. Here's what I've got for the lower.
I'm moving on to the upper now, and I've got a few choices I need to make. I saved some money on the lower, so I can get a little stupid with the upper. Barrel - I'm finding that I can't get all the options I want to play nicely together, even if I'm willing to go custom. My IDEAL barrel would be a 20" chrome-lined HBAR profile with pistol- or carbine-length gas system. Custom shops won't chrome-line though, and standard 20" barrels don't come with short gas systems. So what trade-offs would you make here? Gas - Obviously it'll work fine with a standard gas system, but any thoughts on using something like an Adams Arms piston conversion to get closer to an M249/M27? Upper Receiver - Leaning towards sidecharging upper. Gibbz (which is non-reciprocating and charges on the left side. I have one on my 300blk pistol), Mega (reciprocating, charges on right), Brownells (same), or something else? Optic - Leaning toward Trijicon TA11SDO (or TA11H-G to save some money, I don't really need the RMR). Anybody used magnified optics? The 3.5x35 Trijicons are what have been standard issue on both the M249 and M27, so I'm thinking that they won't be burdensome... Bipod - I suck at tools. I don't want to build something custom. What kind of bipod do you guys recommend on this? Leaning toward a Harris 13.5-27" setup. Handguard - I'll figure this out. Probably just going to do something as long as possible w the barrel length and call it a day. Thanks in advance guys. |
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Posted: 6/3/2016 12:34:09 PM EDT
[#8]
Quote HistoryQuoted:
Barrel - I'm finding that I can't get all the options I want to play nicely together, even if I'm willing to go custom. My IDEAL barrel would be a 20" chrome-lined HBAR profile with pistol- or carbine-length gas system. Custom shops won't chrome-line though, and standard 20" barrels don't come with short gas systems. So what trade-offs would you make here? Gas - Obviously it'll work fine with a standard gas system, but any thoughts on using something like an Adams Arms piston conversion to get closer to an M249/M27? Thanks in advance guys. I can speak on the 20" barrel.. I drilled my gas hole on the barrel to .1094" and installed an SLR Sentry 7 adjustable gas block. As you've seen above mine runs awesome with a standard M16 BCG with this set up.
- Clint |
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Posted: 6/3/2016 1:00:03 PM EDT
[#9]
Quote HistoryQuoted:
I can speak on the 20" barrel.. I drilled my gas hole on the barrel to .1094" and installed an SLR Sentry 7 adjustable gas block. As you've seen above mine runs awesome with a standard M16 BCG with this set up.  https://youtu.be/PBK_p7kgq_o
http://i1288.photobucket.com/albums/b487/AlaskaCajun/Mobile%20Uploads/image_zpspfhojuhm.jpeg - Clint Interesting - who did you get your barrel from? And is that rifle length gas? Also, you have me looking at shitty air soft M249 parts now. Gotta figure out how you mounted that handguard. |
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Posted: 6/3/2016 2:26:27 PM EDT
[#10]
Quote HistoryQuoted:
Interesting - who did you get your barrel from? And is that rifle length gas? Also, you have me looking at shitty air soft M249 parts now. Gotta figure out how you mounted that handguard. Quote HistoryQuoted:
Quoted:
I can speak on the 20" barrel.. I drilled my gas hole on the barrel to .1094" and installed an SLR Sentry 7 adjustable gas block. As you've seen above mine runs awesome with a standard M16 BCG with this set up. https://youtu.be/PBK_p7kgq_o
http://i1288.photobucket.com/albums/b487/AlaskaCajun/Mobile%20Uploads/image_zpspfhojuhm.jpeg - Clint Interesting - who did you get your barrel from? And is that rifle length gas? Also, you have me looking at shitty air soft M249 parts now. Gotta figure out how you mounted that handguard. It's an 18" Faxon Arms barrel with rifle length gas... The only reason I'm using this barrel is because I paid $50 for it... When I replace it, I will most likely use a heavier barrel under the handguard with fluting... Here is a link to the build - Clint |
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Posted: 6/4/2016 9:16:08 PM EDT
[#11]
I still need to buy the gas tube, gas block, and muzzle device.... but here is the core of my new upper mocked up.
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Posted: 6/4/2016 11:01:15 PM EDT
[#12]
Quote HistoryQuoted:
I still need to buy the gas tube, gas block, and muzzle device.... but here is the core of my new upper mocked up. http://i.imgur.com/kttU1mA.jpg Damn, that's legit! How heavy is that barrel? 
- Clint |
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Posted: 6/4/2016 11:03:21 PM EDT
[#13]
Quote HistoryQuoted:
Damn, that's legit! How heavy is that barrel?
- Clint Quote HistoryQuoted:
Quoted:
I still need to buy the gas tube, gas block, and muzzle device.... but here is the core of my new upper mocked up. http://i.imgur.com/kttU1mA.jpg Damn, that's legit! How heavy is that barrel?
- Clint 2.66 pounds. Dimples are sexy. 
And I'm thinking about going with a Spike's Barking Spider muzzle device... increased back pressure is good, no? And it has dimples. I like dimples. It's that or find a hex patterned tube muzzle device. Useless, but it would make for a pretty build and lots of flash and recoil. 
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Posted: 6/4/2016 11:09:33 PM EDT
[#14]
Yeah, I like the look of that Spike's... I like the upper too... the whole "look" is unique! I like the direction you are going with it!
- Clint |
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Posted: 6/4/2016 11:13:40 PM EDT
[#15]
Quote HistoryQuoted:
Yeah, I like the look of that Spike's... I like the upper too... the whole "look" is unique! I like the direction you are going with it!
- Clint Thanks!! I haven't the skill to build a true SAW look alike as you have, so I'm going the artsy fartsy route. That and the barrel is an SPR profile (.840 under the handguard until the gas block, roughly 12 inches of thick) and the handguard should allow for plenty of convection cooling. |
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Posted: 6/5/2016 12:08:06 AM EDT
[#16]
Quote HistoryQuoted: I still need to buy the gas tube, gas block, and muzzle device.... but here is the core of my new upper mocked up. http://i.imgur.com/kttU1mA.jpg |
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Posted: 6/5/2016 5:25:40 PM EDT
[#17]
Quote HistoryQuoted:
2.66 pounds. Dimples are sexy. http://i.imgur.com/GukPPUR.jpg And I'm thinking about going with a Spike's Barking Spider muzzle device... increased back pressure is good, no? And it has dimples. I like dimples. It's that or find a hex patterned tube muzzle device. Useless, but it would make for a pretty build and lots of flash and recoil. https://4b1e874935ea5d25a97e-f099844d0e354c7ab50c55a966be6870.ssl.cf2.rackcdn.com/product/XSTAKB0100D.jpg https://farm9.staticflickr.com/8590/16534688919_e5f1109167_c.jpg Quote HistoryQuoted:
Quoted:
Quoted:
I still need to buy the gas tube, gas block, and muzzle device.... but here is the core of my new upper mocked up. http://i.imgur.com/kttU1mA.jpg Damn, that's legit! How heavy is that barrel?
- Clint 2.66 pounds. Dimples are sexy. http://i.imgur.com/GukPPUR.jpg And I'm thinking about going with a Spike's Barking Spider muzzle device... increased back pressure is good, no? And it has dimples. I like dimples. It's that or find a hex patterned tube muzzle device. Useless, but it would make for a pretty build and lots of flash and recoil. https://4b1e874935ea5d25a97e-f099844d0e354c7ab50c55a966be6870.ssl.cf2.rackcdn.com/product/XSTAKB0100D.jpg https://farm9.staticflickr.com/8590/16534688919_e5f1109167_c.jpg How many cuts did that machine have to make to produce that? ALL OF THEM.
Going to be an interesting one for sure! |
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Posted: 6/5/2016 6:19:28 PM EDT
[#18]
Quote HistoryQuoted: 6.8 SPC is different from 6.5 Grendel. Quote HistoryQuoted: Quoted: Quoted: Quoted: Some crazy idea makes me want to do this with my 6.8... Great ballistics. Hope you reload. 6.8 SPC is different from 6.5 Grendel. |
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Posted: 6/6/2016 1:12:29 AM EDT
[#19]
Quote HistoryQuoted: Yes, but it has better ballistics, and no need to reload. Dear God, please don't derail this thread into a purse match over caliber. |
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Posted: 6/6/2016 11:28:20 AM EDT
[#20]
Tag for later research
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Posted: 6/9/2016 8:50:11 AM EDT
[#21]
Well, my lower is finally complete!
Here's a link to the album, if the pictures below turn out funky (I'm new around here and it seems it's embedding them WAY too big) I started with an Anderson Manufacturing lower. 
Engraved by Tennessee Arms Co. 
Check that detail. 
Geissele S3G trigger. 
All put together with a Surefire 100-rounder 
DA RED WUNZ GO FASTA!1! 
Now onto the upper. I'm putting an 18" SOCOM profile melonited barrel, mid-length profile, on from Hardened Arms, with a 15" MLOK free float rail. ACOG TA11MGO-249. 13.5-27" Harris Bipod. Upper comes on Tuesday, optic and bipod won't be in till late July, but I'm out of town for 2 weeks coming up anyway. |
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Posted: 6/9/2016 11:59:17 AM EDT
[#22]
I see you're getting a bipod to match that magazine. Was looking @ that yesterday, and thinking about trying the bipod on the left side rail, and the red dot on the right side. Wonder if I could make that run...
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Posted: 6/9/2016 5:13:04 PM EDT
[#23]
Quote HistoryQuoted:
Well, my lower is finally complete! Here's a link to the album, if the pictures below turn out funky (I'm new around here and it seems it's embedding them WAY too big) I started with an Anderson Manufacturing lower. http://i.imgur.com/WDVEqbC.jpg?2 Engraved by Tennessee Arms Co. http://i.imgur.com/y3kqV57.jpg?1 Check that detail. http://i.imgur.com/No9sFpL.jpg Geissele S3G trigger. http://i.imgur.com/uWrRSHo.jpg All put together with a Surefire 100-rounder http://i.imgur.com/998ir19.jpg DA RED WUNZ GO FASTA!1! http://i.imgur.com/W3XZIep.jpg?1 Now onto the upper. I'm putting an 18" SOCOM profile melonited barrel, mid-length profile, on from Hardened Arms, with a 15" MLOK free float rail. ACOG TA11MGO-249. 13.5-27" Harris Bipod. Upper comes on Tuesday, optic and bipod won't be in till late July, but I'm out of town for 2 weeks coming up anyway. looking good so far! - Clint |
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Posted: 6/9/2016 8:30:59 PM EDT
[#24]
Quote HistoryQuoted:
Well, my lower is finally complete! Here's a link to the album, if the pictures below turn out funky (I'm new around here and it seems it's embedding them WAY too big) I started with an Anderson Manufacturing lower. http://i.imgur.com/WDVEqbC.jpg?2 Engraved by Tennessee Arms Co. http://i.imgur.com/y3kqV57.jpg?1 Check that detail. http://i.imgur.com/No9sFpL.jpg Geissele S3G trigger. http://i.imgur.com/uWrRSHo.jpg All put together with a Surefire 100-rounder http://i.imgur.com/998ir19.jpg DA RED WUNZ GO FASTA!1! http://i.imgur.com/W3XZIep.jpg?1 Now onto the upper. I'm putting an 18" SOCOM profile melonited barrel, mid-length profile, on from Hardened Arms, with a 15" MLOK free float rail. ACOG TA11MGO-249. 13.5-27" Harris Bipod. Upper comes on Tuesday, optic and bipod won't be in till late July, but I'm out of town for 2 weeks coming up anyway. Always exciting to see another BumpSAW come into being! |
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Posted: 6/9/2016 8:31:38 PM EDT
[#25]
Quote HistoryQuoted:
I see you're getting a bipod to match that magazine. Was looking @ that yesterday, and thinking about trying the bipod on the left side rail, and the red dot on the right side. Wonder if I could make that run... So like a left handed Sten? |
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Posted: 6/9/2016 10:11:08 PM EDT
[#26]
Gas tube, gas block, and muzzle device came in today.
I guess I need to assemble this thing over the weekend. More dimples.... for her pleasure. (And extra back pressure!) 
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Posted: 6/10/2016 8:23:44 AM EDT
[#27]
Quote HistoryQuoted:
Gas tube, gas block, and muzzle device came in today. I guess I need to assemble this thing over the weekend. More dimples.... for her pleasure. (And extra back pressure!) http://i.imgur.com/fTKXZmJ.jpg Any kind of objective way to measure what this did to your gas system? Like where brass was piling before vs now? |
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Posted: 6/10/2016 9:25:58 PM EDT
[#28]
Quote HistoryQuoted:
So like a left handed Sten? Quote HistoryQuoted:
Quoted: I see you're getting a bipod to match that magazine. Was looking @ that yesterday, and thinking about trying the bipod on the left side rail, and the red dot on the right side. Wonder if I could make that run... So like a left handed Sten? Yep, but you'd have to chicken wing it like it was 1963... |
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Posted: 6/11/2016 5:54:43 PM EDT
[#29]
Quote HistoryQuoted:
Yep, but you'd have to chicken wing it like it was 1963... Quote HistoryQuoted:
Quoted:
Quoted: I see you're getting a bipod to match that magazine. Was looking @ that yesterday, and thinking about trying the bipod on the left side rail, and the red dot on the right side. Wonder if I could make that run... So like a left handed Sten? Yep, but you'd have to chicken wing it like it was 1963... So I was thinking... Turn the whole gun upside down Add a scissor linkage to the trigger that effetely moves it where the rear sight would be Invert bump stock, Mount 45° offset irons to Mount bipod where front sight would be. OR Do all of the above, but leave the stock in the normal position, remove the pistol grip add a passive grip where mentioned use the left hand to activate the trigger. |
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Posted: 6/11/2016 6:10:43 PM EDT
[#30]
Quote HistoryQuoted:
I find myself wanting to try one of these, but not at that price. http://accurateshooter.net/pix/phoenixpod1601.jpg http://www.targetshooter.co.uk/wp-content/uploads/2016/01/Phoenix-Bipod-Pic-8.png You could look into a vltor modpod. Try an airsoft knockoff to see if you like the design, if you do, try the "real" one. The Vltors go for about $180 bucks. |
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Posted: 6/11/2016 6:12:31 PM EDT
[#31]
Quote HistoryQuoted:
You could look into a vltor modpod. Try an airsoft knockoff to see if you like the design, if you do, try the "real" one. The Vltors go for about $180 bucks. Quote HistoryQuoted:
Quoted:
I find myself wanting to try one of these, but not at that price. http://accurateshooter.net/pix/phoenixpod1601.jpg http://www.targetshooter.co.uk/wp-content/uploads/2016/01/Phoenix-Bipod-Pic-8.png You could look into a vltor modpod. Try an airsoft knockoff to see if you like the design, if you do, try the "real" one. The Vltors go for about $180 bucks. My Bumpsaw uses a VLTOR ModPod. I also have a cheap airsoft knockoff as a spare. I haven't tried the knock off, but the real deal is rather nice. |
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Posted: 6/11/2016 6:48:41 PM EDT
[#32]
Quote HistoryQuoted:
My Bumpsaw uses a VLTOR ModPod. I also have a cheap airsoft knockoff as a spare. I haven't tried the knock off, but the real deal is rather nice. Quote HistoryQuoted:
Quoted:
Quoted:
I find myself wanting to try one of these, but not at that price. http://accurateshooter.net/pix/phoenixpod1601.jpg http://www.targetshooter.co.uk/wp-content/uploads/2016/01/Phoenix-Bipod-Pic-8.png You could look into a vltor modpod. Try an airsoft knockoff to see if you like the design, if you do, try the "real" one. The Vltors go for about $180 bucks. My Bumpsaw uses a VLTOR ModPod. I also have a cheap airsoft knockoff as a spare. I haven't tried the knock off, but the real deal is rather nice. I've wanted to try one out for a while, but I'm too balls deep into clones right now to spend money on stuff like that.
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Posted: 6/11/2016 8:04:34 PM EDT
[#33]
Quote HistoryQuoted:
My Bumpsaw uses a VLTOR ModPod. I also have a cheap airsoft knockoff as a spare. I haven't tried the knock off, but the real deal is rather nice. Quote HistoryQuoted:
Quoted:
Quoted:
I find myself wanting to try one of these, but not at that price. http://accurateshooter.net/pix/phoenixpod1601.jpg http://www.targetshooter.co.uk/wp-content/uploads/2016/01/Phoenix-Bipod-Pic-8.png You could look into a vltor modpod. Try an airsoft knockoff to see if you like the design, if you do, try the "real" one. The Vltors go for about $180 bucks. My Bumpsaw uses a VLTOR ModPod. I also have a cheap airsoft knockoff as a spare. I haven't tried the knock off, but the real deal is rather nice. They definitely have a cool look. I don't like that the legs don't go up further though. My SF60 mag has been perfect thus far. |
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Posted: 6/11/2016 8:08:29 PM EDT
[#34]
Quote HistoryQuoted: So I was thinking...
Turn the whole gun upside down Add a scissor linkage to the trigger that effetely moves it where the rear sight would be Invert bump stock, Mount 45° offset irons to Mount bipod where front sight would be. OR Do all of the above, but leave the stock in the normal position, remove the pistol grip add a passive grip where mentioned use the left hand to activate the trigger. BumpBREN! Pinkie pull? If I get some 45 degree mounts I'll give it a shot. Have to get me a bipod grip 1st. Originally conceived an upside down AR to stay legal w/in PDRNY & PDRCT laws. NY needs a single column hopper fed by stripper clips, and CT needs the trigger hand above or alongside the action of the rifle. |
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Posted: 6/11/2016 8:15:35 PM EDT
[#35]
Quote HistoryQuoted:
BumpBREN! Pinkie pull? Still kicking myself for not buying that top-feed M96 that was on the EE a few months ago. Could use the Surefire 100s easily with that (okay, functionally easy, you still have 100 rounds levering around in the breeze above the bore line )
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Posted: 6/11/2016 10:25:36 PM EDT
[#36]
Quote HistoryQuoted:
Still kicking myself for not buying that top-feed M96 that was on the EE a few months ago. Could use the Surefire 100s easily with that (okay, functionally easy, you still have 100 rounds levering around in the breeze above the bore line )Quote HistoryQuoted:
Quoted: BumpBREN! Pinkie pull? Still kicking myself for not buying that top-feed M96 that was on the EE a few months ago. Could use the Surefire 100s easily with that (okay, functionally easy, you still have 100 rounds levering around in the breeze above the bore line )Not if you use a 100 or 150 twin drum. 
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Posted: 6/13/2016 8:44:05 AM EDT
[#38]
Cool updates since I last posted; Time to update mine!
This is what I'm working with if you don't remember: 
barrel is an 18" HBAR (mid), handguards are the m16 M203 version, and the bipod is from an M249 SAW. Others wanted to see how it all went together, so here it is, now that I've gotten all the parts to finish the upper. Bare barrel w/gas system: 
Next I put on the handguards with the end cap. The shaft collar (.75"/1.25") slides down and acts like a dissy gas block. It's tightened down with a set screw. 2 small problems here: the low pro gas block for the actual gas system is a little tall and presses on the aluminum reflectors of the hand guards. May not end up being a problem, but I'll keep my eye on the handguards for overheating when I'm shooting. Second, without a gas tube going through the handguard cap, it's free to rotate(with the handguards) around the barrel. I fixed this with high temp JB weld, but we'll see how that holds up. I'm hoping that the HBAR and gas system profile will take the brunt of the heat and that the shaft collar will act as a good heat sink, but it may not. 
Next with the bipod: All I did was hammer it down over the shaft collar. It's a perfect fit and holds in pretty well with just the friction. I may throw in some more high temp jbweld, but I won't yet. The bipod covers the hex head on the shaft collar and I may still need to remove it to do some tweaking. 
So that's where I'm at now. I have all the parts for the lower, I'll post pics tomorrow with what I've got! Hopefully get to the range soon and try it! |
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Posted: 6/13/2016 8:51:05 AM EDT
[#39]
It is nice to see all of the refinements and lore coming from this thread..
Great thread. |
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Posted: 6/13/2016 11:24:48 AM EDT
[#40]
Quote HistoryQuoted:
Cool updates since I last posted; Time to update mine! This is what I'm working with if you don't remember: http://i649.photobucket.com/albums/uu212/bes5318/F8AEBA48-5218-416C-8D9B-B9340387CD8C_zpsge4m6tld.jpg http://i649.photobucket.com/albums/uu212/bes5318/F5EF49F9-9CDA-431A-932D-305AAAB74BA4_zpsydo0h81n.jpg barrel is an 18" HBAR (mid), handguards are the m16 M203 version, and the bipod is from an M249 SAW. Others wanted to see how it all went together, so here it is, now that I've gotten all the parts to finish the upper. Bare barrel w/gas system: http://i649.photobucket.com/albums/uu212/bes5318/331DC2CA-5E66-4808-A850-3BC057E84CE2_zpso07bl6qr.jpg Next I put on the handguards with the end cap. The shaft collar (.75"/1.25") slides down and acts like a dissy gas block. It's tightened down with a set screw. 2 small problems here: the low pro gas block for the actual gas system is a little tall and presses on the aluminum reflectors of the hand guards. May not end up being a problem, but I'll keep my eye on the handguards for overheating when I'm shooting. Second, without a gas tube going through the handguard cap, it's free to rotate(with the handguards) around the barrel. I fixed this with high temp JB weld, but we'll see how that holds up. I'm hoping that the HBAR and gas system profile will take the brunt of the heat and that the shaft collar will act as a good heat sink, but it may not. http://i649.photobucket.com/albums/uu212/bes5318/601912A8-00C4-4259-917B-3A7E77232EA6_zpstvyglkk8.jpg http://i649.photobucket.com/albums/uu212/bes5318/C639608E-5929-4E21-8D30-27470E629376_zpsxvg8megh.jpg?t=1465734671 http://i649.photobucket.com/albums/uu212/bes5318/33CF7958-5AC7-425B-B5D5-DC832F8F2F57_zpsoh2eriou.jpg?t=1465735130 Next with the bipod: All I did was hammer it down over the shaft collar. It's a perfect fit and holds in pretty well with just the friction. I may throw in some more high temp jbweld, but I won't yet. The bipod covers the hex head on the shaft collar and I may still need to remove it to do some tweaking. http://i649.photobucket.com/albums/uu212/bes5318/EC60ACDD-6B83-4D5C-B9AE-37896C448644_zpsigdc5l5o.jpg http://i649.photobucket.com/albums/uu212/bes5318/8E2F9BEE-61F7-410C-9759-C2D2C034DBB0_zpsnabdmwew.jpg So that's where I'm at now. I have all the parts for the lower, I'll post pics tomorrow with what I've got! Hopefully get to the range soon and try it! I REALLY like that bipod adapter... great job on the build!
- Clint |
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Posted: 6/13/2016 11:40:59 AM EDT
[#41]
Quote HistoryQuoted:
I REALLY like that bipod adapter... great job on the build!
- Clint Quote HistoryQuoted:
Quoted:
Cool updates since I last posted; Time to update mine! This is what I'm working with if you don't remember: http://i649.photobucket.com/albums/uu212/bes5318/F8AEBA48-5218-416C-8D9B-B9340387CD8C_zpsge4m6tld.jpg http://i649.photobucket.com/albums/uu212/bes5318/F5EF49F9-9CDA-431A-932D-305AAAB74BA4_zpsydo0h81n.jpg barrel is an 18" HBAR (mid), handguards are the m16 M203 version, and the bipod is from an M249 SAW. Others wanted to see how it all went together, so here it is, now that I've gotten all the parts to finish the upper. Bare barrel w/gas system: http://i649.photobucket.com/albums/uu212/bes5318/331DC2CA-5E66-4808-A850-3BC057E84CE2_zpso07bl6qr.jpg Next I put on the handguards with the end cap. The shaft collar (.75"/1.25") slides down and acts like a dissy gas block. It's tightened down with a set screw. 2 small problems here: the low pro gas block for the actual gas system is a little tall and presses on the aluminum reflectors of the hand guards. May not end up being a problem, but I'll keep my eye on the handguards for overheating when I'm shooting. Second, without a gas tube going through the handguard cap, it's free to rotate(with the handguards) around the barrel. I fixed this with high temp JB weld, but we'll see how that holds up. I'm hoping that the HBAR and gas system profile will take the brunt of the heat and that the shaft collar will act as a good heat sink, but it may not. http://i649.photobucket.com/albums/uu212/bes5318/601912A8-00C4-4259-917B-3A7E77232EA6_zpstvyglkk8.jpg http://i649.photobucket.com/albums/uu212/bes5318/C639608E-5929-4E21-8D30-27470E629376_zpsxvg8megh.jpg?t=1465734671 http://i649.photobucket.com/albums/uu212/bes5318/33CF7958-5AC7-425B-B5D5-DC832F8F2F57_zpsoh2eriou.jpg?t=1465735130 Next with the bipod: All I did was hammer it down over the shaft collar. It's a perfect fit and holds in pretty well with just the friction. I may throw in some more high temp jbweld, but I won't yet. The bipod covers the hex head on the shaft collar and I may still need to remove it to do some tweaking. http://i649.photobucket.com/albums/uu212/bes5318/EC60ACDD-6B83-4D5C-B9AE-37896C448644_zpsigdc5l5o.jpg http://i649.photobucket.com/albums/uu212/bes5318/8E2F9BEE-61F7-410C-9759-C2D2C034DBB0_zpsnabdmwew.jpg So that's where I'm at now. I have all the parts for the lower, I'll post pics tomorrow with what I've got! Hopefully get to the range soon and try it! I REALLY like that bipod adapter... great job on the build!
- Clint Quick funny story: I've got a welder/machinist friend who I pass all my project ideas by (I'm a mech engineer and I sometimes get a little too theoretical). I took all these measurements of the barrel OD, the bipod ring Inner diameter, did research on set screw sizes etc, and made up a 3D model of my "bipod adapter". Sent him the file asking if he knew of any materials to use, or if he thought he might be able to fabricate it in his shop. He looks at it for a half second and says: "So you want a shaft collar?" "A shaft collar?" "Yea, that's what this is, isn't it?" I quick look up "shaft collar" on ebay and found exactly what I was looking for for $2.75; I felt pretty stupid. Just cause I'm an engineer doesn't mean I'm familiar with machinery lol. |
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Posted: 6/13/2016 5:44:48 PM EDT
[#42]
Quote HistoryQuoted:
Quick funny story: I've got a welder/machinist friend who I pass all my project ideas by (I'm a mech engineer and I sometimes get a little too theoretical). I took all these measurements of the barrel OD, the bipod ring Inner diameter, did research on set screw sizes etc, and made up a 3D model of my "bipod adapter". Sent him the file asking if he knew of any materials to use, or if he thought he might be able to fabricate it in his shop. He looks at it for a half second and says: "So you want a shaft collar?" "A shaft collar?" "Yea, that's what this is, isn't it?" I quick look up "shaft collar" on ebay and found exactly what I was looking for for $2.75; I felt pretty stupid. Just cause I'm an engineer doesn't mean I'm familiar with machinery lol. 
I had to use a similar bushing on my bipod to adapt it to the airsoft M249 part that holds the fake bipod on... they are different sizes... I went to Alaska Bearing next door and the guy took the 2 pieces and walked out back, he came back about a minute later and said "That'll be $2." - Clint |
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Posted: 6/13/2016 5:59:15 PM EDT
[#43]
The new BumpSAWs here are all really cool! Very exciting stuff.
Does the one with the shaft collar cant to the sides at all, and does Hansen's have something to stop it from canting?
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Posted: 6/14/2016 9:09:28 AM EDT
[#44]
Quote HistoryQuoted:
The new BumpSAWs here are all really cool! Very exciting stuff. Does the one with the shaft collar cant to the sides at all, and does Hansen's have something to stop it from canting?
If I understand what you're asking, the 249 bipod doesn't really allow any rotation along the barrel axis. There is some unintentional canting because the friction fit isn't quite tight enough, but I think I'll be able to fix it. I'd like to weld the 3 components together and make a single front block/bipod adapter (end cap to the shaft collar, and bipod ring over the shaft collar. Only problem is that I would need to drill a small hole in the bipod ring so that I could still access the shaft collar's set screw. Seems like an easy task, but the ring is hardened steel for some reason. Drill bits and files just skate right over it. I'm going to hit it with a blow torch this weekend and see if I can get it soft enough to drill. Assmbled pics btw! I stopped by my FFL last night and grabbed an ATI lower and then another one because he was getting cleaned out by panicked buyers. Also got some tracers so that I can do some real SAW fun . Shooting her tonight for the first time, hopefully get some pics and maybe a video posted this weekend. Please excuse the shitty-ass micro dot. I've got an Aimpoint look-alike coming on Thursday that should look much better.
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Posted: 6/14/2016 9:30:54 AM EDT
[#45]
... you put an ATI polymer lower on a bump fire? Or do they have real lowers? I've only heard terrible things about them...
This oughta be good. Video the whole thing so we can watch your rifle shake itself apart. |
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Posted: 6/14/2016 9:35:23 AM EDT
[#46]
Quote HistoryQuoted:
... you put an ATI polymer lower on a bump fire? Or do they have real lowers? I've only heard terrible things about them... This oughta be good. Video the whole thing so we can watch your rifle shake itself apart. No, this is a milsport forged aluminum lower. I've also heard bad things about the polymer one, but this one is gtg as far as I can tell. |
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Posted: 6/14/2016 9:40:21 AM EDT
[#47]
Quote HistoryQuoted:
The new BumpSAWs here are all really cool! Very exciting stuff. Expect to see more soon. I've been recruiting new bumpsaw builders in my deal thread.
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Posted: 6/14/2016 10:38:07 AM EDT
[#48]
Quote HistoryQuoted:
If I understand what you're asking, the 249 bipod doesn't really allow any rotation along the barrel axis. There is some unintentional canting because the friction fit isn't quite tight enough, but I think I'll be able to fix it. I'd like to weld the 3 components together and make a single front block/bipod adapter (end cap to the shaft collar, and bipod ring over the shaft collar. Only problem is that I would need to drill a small hole in the bipod ring so that I could still access the shaft collar's set screw. Seems like an easy task, but the ring is hardened steel for some reason. Drill bits and files just skate right over it. I'm going to hit it with a blow torch this weekend and see if I can get it soft enough to drill. Assmbled pics btw! I stopped by my FFL last night and grabbed an ATI lower and then another one because he was getting cleaned out by panicked buyers. Also got some tracers so that I can do some real SAW fun . Shooting her tonight for the first time, hopefully get some pics and maybe a video posted this weekend. Please excuse the shitty-ass micro dot. I've got an Aimpoint look-alike coming on Thursday that should look much better.
http://i649.photobucket.com/albums/uu212/bes5318/23A035F3-5429-422C-80C1-379CB4173634_zpsj4daslso.jpg http://i649.photobucket.com/albums/uu212/bes5318/03E5FE37-DD88-4E0B-830B-3A5026B7DE8A_zpszy2mdmet.jpg http://i649.photobucket.com/albums/uu212/bes5318/E5F8036D-180C-49A4-A0E1-48D5D99C4189_zpsrkyzezkn.jpg Quote HistoryQuoted:
Quoted:
The new BumpSAWs here are all really cool! Very exciting stuff. Does the one with the shaft collar cant to the sides at all, and does Hansen's have something to stop it from canting?
If I understand what you're asking, the 249 bipod doesn't really allow any rotation along the barrel axis. There is some unintentional canting because the friction fit isn't quite tight enough, but I think I'll be able to fix it. I'd like to weld the 3 components together and make a single front block/bipod adapter (end cap to the shaft collar, and bipod ring over the shaft collar. Only problem is that I would need to drill a small hole in the bipod ring so that I could still access the shaft collar's set screw. Seems like an easy task, but the ring is hardened steel for some reason. Drill bits and files just skate right over it. I'm going to hit it with a blow torch this weekend and see if I can get it soft enough to drill. Assmbled pics btw! I stopped by my FFL last night and grabbed an ATI lower and then another one because he was getting cleaned out by panicked buyers. Also got some tracers so that I can do some real SAW fun . Shooting her tonight for the first time, hopefully get some pics and maybe a video posted this weekend. Please excuse the shitty-ass micro dot. I've got an Aimpoint look-alike coming on Thursday that should look much better.
http://i649.photobucket.com/albums/uu212/bes5318/23A035F3-5429-422C-80C1-379CB4173634_zpsj4daslso.jpg http://i649.photobucket.com/albums/uu212/bes5318/03E5FE37-DD88-4E0B-830B-3A5026B7DE8A_zpszy2mdmet.jpg http://i649.photobucket.com/albums/uu212/bes5318/E5F8036D-180C-49A4-A0E1-48D5D99C4189_zpsrkyzezkn.jpg Well it looks great! Very creative. On a real saw, there is probably a 15° swing both ways for canting. I think Clint's is close enough to the real thing that he should be able to show a close up!
Also, the SAW bipod was a breaking fool in the USMC. I suspect they were trying to minimize that with really hard steel. I'm sure you won't be beating on yours like we did ours though. |
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Posted: 6/14/2016 10:59:29 PM EDT
[#49]
Last update in this burst:
Took my m203/249 bumpsaw to the range and got her running. Pretty successful in cycling. Easy to get 4-5 round bursts at around .09-.10 sec splits so appx 600-650 RPM. I'll take it to start. May slow down a little when I get the heavier optic on it. For now I'll take it. This weekend I'll really put her through the paces and take its final pics and weights and writeup a complete parts list. 
I will confess however that the BCG has not been purchased yet (I borrowed a standard ar15 BCG from another build to see if it would work). Would getting a lightweight BCG up the recoil and also the RPM? |
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Posted: 6/14/2016 11:06:01 PM EDT
[#50]
Quote HistoryQuoted:
Last update in this burst: Took my m203/249 bumpsaw to the range and got her running. Pretty successful in cycling. Easy to get 4-5 round bursts at around .09-.10 sec splits so appx 600-650 RPM. I'll take it to start. May slow down a little when I get the heavier optic on it. For now I'll take it. This weekend I'll really put her through the paces and take its final pics and weights and writeup a complete parts list. http://i649.photobucket.com/albums/uu212/bes5318/5E7CB682-333E-4430-8AC9-A177C5246B41_zps0byghl4s.jpg I will confess however that the BCG has not been purchased yet (I borrowed a standard ar15 BCG from another build to see if it would work). Would getting a lightweight BCG up the recoil and also the RPM? It won't up the recoil, but it will make it easier to bump fire because the hammer is where it should be every time. You won't be disappointed. Looking forward to video! |
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