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Posted: 12/7/2016 1:43:27 PM EDT
[#1]
Consensus has been 4.5 inches in order to keep bulk packs subsonic.
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Posted: 12/7/2016 1:59:32 PM EDT
[#2]
Agree. 4.5 works great. What length will you cut your rail?
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Posted: 12/7/2016 2:05:31 PM EDT
[#3]
Quote HistoryQuoted:
Agree. 4.5 works great. What length will you cut your rail? I plan to cut the rail so the suppressor sticks out about an inch or so. I don't want to cut more than I have to. |
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Posted: 12/7/2016 3:00:03 PM EDT
[#4]
I have a 6.5" CMMG barrel on my 22 SBR, it keeps 99% of bulk pack rounds supersonic. I would go with the 4.5" barrel recommendation if your goal is to make bulk pack subsonic.
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Posted: 12/7/2016 3:27:53 PM EDT
[#5]
Quote HistoryQuoted:
I have a 6.5" CMMG barrel on my 22 SBR, it keeps 99% of bulk pack rounds supersonic. I would go with the 4.5" barrel recommendation if your goal is to make bulk pack subsonic. Would there be any noticeable difference in velocity from 6.5" to 4.5"? |
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Posted: 12/7/2016 3:38:31 PM EDT
[#6]
I went with 4.5" and SiCo's o-ring specs:
Cut the rail so that ~1" of my Spectre sticks out. There are only a couple locations available to cut (depending on rail) assuming you don't want a jagged edge due to cutting through an opening in the rail. 
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Posted: 12/7/2016 3:42:26 PM EDT
[#7]
Quote HistoryQuoted:
I plan to cut the rail so the suppressor sticks out about an inch or so. I don't want to cut more than I have to. I have a CMMG 4.5" barrel under a 7" KMR and a Dead Air Mask. That arrangement does exactly this and is silly lightweight. On top of that I put a PDW stock (because why shouldn't a stock be half of the value of the whole gun?) and OAL is now 21.5". No buffer and spring adds to the lightness. |
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Posted: 12/7/2016 3:56:45 PM EDT
[#8]
Quote HistoryQuoted:
I went with 4.5" and SiCo's o-ring specs: http://i751.photobucket.com/albums/xx151/thegreghorton/Mobile%20Uploads/B8A262DA-C13D-4344-A254-BA578590FEF7_zpswg5dhc0l.jpg Cut the rail so that ~1" of my Spectre sticks out. There are only a couple locations available to cut (depending on rail) assuming you don't want a jagged edge due to cutting through an opening in the rail. http://i751.photobucket.com/albums/xx151/thegreghorton/Mobile%20Uploads/26E6869D-CAE5-42D9-A6F2-6592E323A8BF_zpsspr1tjzk.jpg What did you use to cut the rail? |
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Posted: 12/7/2016 3:57:14 PM EDT
[#9]
Quote HistoryQuoted:
I have a CMMG 4.5" barrel under a 7" KMR and a Dead Air Mask. That arrangement does exactly this and is silly lightweight. On top of that I put a PDW stock (because why shouldn't a stock be half of the value of the whole gun?) and OAL is now 21.5". No buffer and spring adds to the lightness. How did you install the PDW stock to the 15-22? |
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Posted: 12/7/2016 4:06:35 PM EDT
[#10]
Quote HistoryQuoted:
How did you install the PDW stock to the 15-22? He built it on an AR receiver set. Not a 15-22 |
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Posted: 12/7/2016 4:07:28 PM EDT
[#11]
Quote HistoryQuoted:
How did you install the PDW stock to the 15-22? Sorry, mine was off a regular lower -- the PDW stock replaces the buffer tube. I don't know much about the M&P so I don't know if the rear of the receiver is the same or not. |
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Posted: 12/7/2016 4:49:05 PM EDT
[#12]
Quote HistoryQuoted:
What did you use to cut the rail? Band saw. You can cut a small section off first for practice if you want. 
I went back with a file or sandpaper to clean up some of the edges, but here's what it looked like after the cut: 
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Posted: 12/7/2016 9:06:40 PM EDT
[#13]
My 22 AR build.
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Posted: 12/7/2016 10:43:49 PM EDT
[#14]
I'm torn ...
On one hand I would like to keep bulk packs subsonic, but on the other hand I like to shoot without my can from time to time and don't want my bare muzzle under the hand guard. |
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Posted: 12/8/2016 12:30:06 AM EDT
[#15]
Quote HistoryQuoted:
I went with 4.5" and SiCo's o-ring specs: http://i751.photobucket.com/albums/xx151/thegreghorton/Mobile%20Uploads/B8A262DA-C13D-4344-A254-BA578590FEF7_zpswg5dhc0l.jpg Cut the rail so that ~1" of my Spectre sticks out. There are only a couple locations available to cut (depending on rail) assuming you don't want a jagged edge due to cutting through an opening in the rail. http://i751.photobucket.com/albums/xx151/thegreghorton/Mobile%20Uploads/26E6869D-CAE5-42D9-A6F2-6592E323A8BF_zpsspr1tjzk.jpg How do you install or remove the barrel without being able to clamp the barrel to tighten the barrel nut? |
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Posted: 12/8/2016 12:39:29 AM EDT
[#16]
Quote HistoryQuoted:
How do you install or remove the barrel without being able to clamp the barrel to tighten the barrel nut? I think people make much too big of a deal about that (especially on the S&W forums). I agree you should clamp the barrel on the initial removal since you have no idea how tight the factory installed it. After that, I just snug it up. Never had an issue. |
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Posted: 12/8/2016 12:45:49 AM EDT
[#17]
Quote HistoryQuoted:
I'm torn ... On one hand I would like to keep bulk packs subsonic, but on the other hand I like to shoot without my can from time to time and don't want my bare muzzle under the hand guard. Same here. I think I would be inclined to just shorten a few inches and use CCI Standard Velocity when shooting suppressed. |
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Posted: 12/8/2016 1:40:52 AM EDT
[#18]
Quote HistoryQuoted:
I'm torn ... On one hand I would like to keep bulk packs subsonic, but on the other hand I like to shoot without my can from time to time and don't want my bare muzzle under the hand guard. I have a fake suppressor the same dimensions as my Spectre that I can use to shoot unsuppressed. Had a guy on eBay make me three of them... 
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Posted: 12/8/2016 7:33:25 AM EDT
[#19]
Quote HistoryQuoted:
I have a fake suppressor the same dimensions as my Spectre that I can use to shoot unsuppressed. Same -- I bought one of these (locally made in NC): http://www.ftfindustries.com/product/CP-28FS.html Have to admit I haven't used it since I got the can out of jail though. Need to get around to throwing it on the EE. |
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Posted: 12/8/2016 10:32:58 AM EDT
[#20]
Quote HistoryQuoted:
I have a fake suppressor the same dimensions as my Spectre that I can use to shoot unsuppressed. Had a guy on eBay make me three of them... http://i751.photobucket.com/albums/xx151/thegreghorton/Mobile%20Uploads/9354860B-10D3-4A0C-A41D-72635F4FDE28_zpscecomlpo.jpg http://i751.photobucket.com/albums/xx151/thegreghorton/Mobile%20Uploads/9F692FCA-5C94-4989-8EDE-34DEB605DCF8_zpse8b5pvet.jpg Is this guy still around? How much did one of those run you? I wouldn't mind having the option to shoot without the suppressor sometimes. That's why I am still torn between going 4.5 vs around 10" so I can throw a flash hider on there and go. |
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Posted: 12/8/2016 11:10:18 AM EDT
[#21]
Quote HistoryQuoted:
Is this guy still around? How much did one of those run you? I wouldn't mind having the option to shoot without the suppressor sometimes. That's why I am still torn between going 4.5 vs around 10" so I can throw a flash hider on there and go. I can't remember who I used. But, similar items are definitely available. Just go to eBay and search for "muzzle brake blank". I see some 6" ones listed now. I ended up just contacting one of the sellers and asking them to make what I wanted. There are also several existing fake cans that you could buy. The problem is most of the rimfire size ones I found are 5" long (similar to Sparrow instead of Spectre) |
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Posted: 12/8/2016 11:32:12 AM EDT
[#22]
Quote HistoryQuoted:
Same -- I bought one of these (locally made in NC): http://www.ftfindustries.com/product/CP-28FS.html Have to admit I haven't used it since I got the can out of jail though. Need to get around to throwing it on the EE. How much would you want for it? Did it work well for you? |
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Posted: 12/8/2016 12:27:04 PM EDT
[#23]
4.25" will get CCI Standard velocity rounds to go subsonic.
That's the ticket. |
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Posted: 12/8/2016 12:57:03 PM EDT
[#24]
Originally a 9" CMMG PDW upper, I swapped out the barrel for their 4.5" and sold the 9".
Absolutely LOVE this thing, and so do my kids... Bulk pack and Mini-Mags are subsonic. 
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Posted: 12/8/2016 4:14:15 PM EDT
[#25]
Quote HistoryQuoted:
Would there be any noticeable difference in velocity from 6.5" to 4.5"? IIRC it would drop something like 100 FPS to keep it subsonic. Sorry, I chronographed the 6.5" years ago but don't recall the numbers. Every now and again I will get a Federal Bulk pack round to go subsonic, when it does it is noticeably quieter. |
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Posted: 12/8/2016 7:54:58 PM EDT
[#26]
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Posted: 12/17/2016 9:55:07 PM EDT
[#27]
I did the 4.5" barrel as well. Sent it in to ADCO and was done in a few days
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Posted: 12/17/2016 10:26:48 PM EDT
[#28]
Ok, I have decided to go 4.5, and run a fake suppressor when I take my Spectre off to run it on the .22 pistol. Now, what did you guys do for engraving?
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Posted: 12/18/2016 9:04:02 AM EDT
[#29]
Quote HistoryQuoted:
4.25" will get CCI Standard velocity rounds to go subsonic. That's the ticket. "CCI Standard Velocity" is subsonic in barrels 4x that length... |
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Posted: 12/18/2016 3:25:09 PM EDT
[#30]
Quote HistoryQuoted:
Ok, I have decided to go 4.5, and run a fake suppressor when I take my Spectre off to run it on the .22 pistol. Now, what did you guys do for engraving? I just took a Dremel to the front of the magwell. It ain't pretty, but it's legal...and was free. ETA: THSF has laser engraved quite a few polymer firearms and they look great |
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Posted: 12/18/2016 5:22:16 PM EDT
[#31]
I did the Dremel engraver thing as well. Taped the trust name on the receiver and traced the letters. Not too bad but can tell it was hand done. Gives something for the kids to look at when I'm gone and it is passed to them.
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Posted: 12/22/2016 10:17:40 PM EDT
[#32]
What are you guys doing with these things? How far are they accurate out to?
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Posted: 12/23/2016 8:17:24 AM EDT
[#33]
Not to be sarcastic but shooting it. Quiet and my daughter can handle it better due to the weight and adjustable stock.
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Posted: 12/23/2016 1:08:18 PM EDT
[#34]
Quote HistoryQuoted:
Same -- I bought one of these (locally made in NC): http://www.ftfindustries.com/product/CP-28FS.html Have to admit I haven't used it since I got the can out of jail though. Need to get around to throwing it on the EE. Let me know if you want to sell it, I may be very interested. |
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Posted: 12/28/2016 7:35:26 PM EDT
[#35]
Just finished my 4.5" CMMG build last night, it's stupid lighweight: 5lbs with empty mag, 4.7lbs with no mag, 4.2lbs without mag and suppressor. Surprisingly it's a couple inches shorter than my 10/22 SBR with same length barrel.
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Posted: 1/4/2017 7:11:44 PM EDT
[#36]
I copied BigWaylon (thank you sir
 ) and went with 4.5 and cut the factory rail. I didn't have a band saw but my miter saw gave me a perfectly clean cut, no sanding needed (depending on the blade you use) and someone you know will have one.
Plenty of rail to cut, so do a practice cut until you get it right and to make sure your blade you're using has enough teeth to make a clean cut. I cut off a litttttle more than I wanted, so make sure you cut slightly long then screw the suppressor on and evaluate. I would strongly suggest just keeping the poly rail and cutting it, this is paper light this way 
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Posted: 1/7/2017 2:20:08 PM EDT
[#37]
Quote HistoryQuoted:
I copied BigWaylon (thank you sir ) and went with 4.5 and cut the factory rail. I didn't have a band saw but my miter saw gave me a perfectly clean cut, no sanding needed (depending on the blade you use) and someone you know will have one.
Plenty of rail to cut, so do a practice cut until you get it right and to make sure your blade you're using has enough teeth to make a clean cut. I cut off a litttttle more than I wanted, so make sure you cut slightly long then screw the suppressor on and evaluate. I would strongly suggest just keeping the poly rail and cutting it, this is paper light this way http://i613.photobucket.com/albums/tt216/taymag/SampW%2015-22%20SBR%20w%20Silencer_zpswbaaya80.jpg I hated the factory cheese grater hand guard and picking a different modern slim style hand guard will not increase the weight. Also, I have the benefit of easily removing the hand guard with two screws should I need to get to my suppressor. Without the magazine: 4.5 lbs with everything on the gun, sling, optic, suppressor, and buis. 
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Posted: 1/7/2017 6:09:05 PM EDT
[#38]
Quote HistoryQuoted:
I hated the factory cheese grater hand guard and picking a different modern slim style hand guard will not increase the weight. Also, I have the benefit of easily removing the hand guard with two screws should I need to get to my suppressor. Without the magazine: 4.5 lbs with everything on the gun, sling, optic, suppressor, and buis. https://www.AR15.Com/media/mediaFiles/404018/DSC01290-121294.jpg 7" geissele? 4.5" barrel? Trying to pick parts on a 4.5" .22lr upper |
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Posted: 1/7/2017 11:06:33 PM EDT
[#39]
Yes correct with a tacsol axiom suppressor.
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