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Posted: 9/26/2017 5:50:26 PM EDT
[Last Edit: PursuitSS]
[#1]
Quote HistoryOriginally Posted By breastroker:
Also just ordered a Fostech upper receiver! Do you mind pointing out where to find them? @breastroker |
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SC, USA
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Posted: 9/26/2017 6:17:28 PM EDT
[#2]
Quote HistoryOriginally Posted By PursuitSS:
I can't find a Fostech upper receiver anywhere, I assume that it's the magnesium/aluminum alloy that Mag Tactical offered. Do you mind pointing out where to find them? @breastroker |
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FL, USA
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Posted: 9/26/2017 6:33:58 PM EDT
[#3]
Quote HistoryOriginally Posted By pscot468:
Try this email address. Sounds like you got an out of spec lower. I can't think of anything else that would cause that. [email protected] |
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FL, USA
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Posted: 9/26/2017 6:36:09 PM EDT
[Last Edit: ar15joe]
[#4]
Quote HistoryOriginally Posted By pscot468:
I bought mine from FTW coatings several months ago. Call 316-943-5800 and ask about the uppers. @pscot468 @pursuitss |
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Posted: 9/26/2017 6:51:57 PM EDT
[Last Edit: IMachineGuns]
[#5]
Quote HistoryOriginally Posted By ar15joe:
@jekbrown @breastroker Hey Guys- I've been having some issues with my Tegra lowers and been calling them all day. I sent them emails yesterday. No answers or responses. I even called New Frontier Armory and talked to them. They said they just drop ship for them and "did not have any other numbers" other than what's published on the site..which I have called before without answers My carrier is sticking to the rear at times. Meaning it catches so far back the bolt does not appear in the ejection port. I have to bang on the top of the receiver with the palm of my hand to get the bolt to come back into battery. The Tegra lower to upper fitment around the buffer tube has a gap that widens towards the top. I'm thinking this causes the buffer tube to be mis-aligned and causes the carrier to bind rearward. On the lowest rear "ear" of the 2A Carrier I can see there is some evidence of dragging. What do you guys think? Of course, the lower I used has the worst gap LOL aagh. I have mixed feelings airing this now but the total lack of responses now and previously don't have me feeling too hopeful. However- if Tegra contacts me and makes good I'll update this. I'll post pics later Sounds like the buffer tube hole is either off location or not parallel/concentric with the carrier in the upper. Most buffer tubes are a bit long on the depth of the id hole. Ben is going to send out one of our "buffer tube builders shim kit" for the buffer tube it is to reduce over travel of the carrier it consist of three shims .07,.100, and .140. They install between the buffer tube and spring and are used limit the total travel of the carrier. They are prevent striking of the carrier and buffer tube with some buffer tube and carrier combinations. The kits have not officially been released yet so your are the first to receive them. I just hope everyone remembers who brought them to market when the knock offs start showing up  The packaging is marked AR10 because that is the most common source for this need although we are seeing it more and more with all the buffer tube, stock options for the AR15 platform.
Thank you for the support Brian |
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Posted: 9/26/2017 7:04:01 PM EDT
[#6]
Ok, this is pretty awesome! Nicely done 2A!
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WA, USA
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Posted: 9/26/2017 7:27:25 PM EDT
[#7]
Yah but... how much do
They weigh? 
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Posted: 9/26/2017 7:37:03 PM EDT
[#8]
Quote HistoryOriginally Posted By ar15joe:
I called - they answered immediately and they said the Fostech uppers are going to be on the market in about 1.5 months so they are not selling them right now :( |
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FL, USA
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Posted: 9/26/2017 8:11:28 PM EDT
[#9]
Quote HistoryOriginally Posted By IMachineGuns:
@ar15joe Sounds like the buffer tube hole is either off location or not parallel/concentric with the carrier in the upper. Most buffer tubes are a bit long on the depth of the id hole. Ben is going to send out one of our "buffer tube builders shim kit" for the buffer tube it is to reduce over travel of the carrier it consist of three shims .07,.100, and .140. They install between the buffer tube and spring and are used limit the total travel of the carrier. They are prevent striking of the carrier and buffer tube with some buffer tube and carrier combinations. The kits have not officially been released yet so your are the first to receive them. I just hope everyone remembers who brought them to market when the knock offs start showing up The packaging is marked AR10 because that is the most common source for this need although we are seeing it more and more with all the buffer tube, stock options for the AR15 platform.https://www.AR15.Com/media/mediaFiles/395355/shim_kit-318117.jpg
Thank you for the support Brian By the way - when are you guys going to come out with a Tuneable Buffer Weight made from Machined Polycarbonate capsule that screws together so one can add/remove tungsten weights? Or tune the gas down and run without any weights for a super light hollow Polycarbonate buffer? @IMachineGuns |
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FL, USA
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Posted: 9/26/2017 8:18:22 PM EDT
[#10]
On another note- the Spikes 11.5 LW CHF barrel chamber 556 is very tight with 223. I may have to polish it a bit...any good suggestions on how to best do this? Maybe just shoot it more...or plug barrel with grease, chamber and extract a few empty rounds coated with flitz and then degrease twice?
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Posted: 9/26/2017 9:10:08 PM EDT
[#11]
Quote HistoryOriginally Posted By PursuitSS:
I can't find a Fostech upper receiver anywhere, I assume that it's the magnesium/aluminum alloy that Mag Tactical offered. Do you mind pointing out where to find them? @breastroker |
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Posted: 9/26/2017 9:56:51 PM EDT
[#12]
Thanks, of course they stayed with the same Forward Assist upper that Mag Tactical had.
I called Mag Tactical when they came out with their upper and asked if they were going to offer it in a "Slick Side" they stated there wouldn't be enough demand for one. I tried to politely point out that they did not understand their target market, obviously they didn't listen. |
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FL, USA
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Posted: 9/27/2017 12:26:43 AM EDT
[#13]
Quote HistoryOriginally Posted By PursuitSS:
Thanks, of course they stayed with the same Forward Assist upper that Mag Tactical had. I called Mag Tactical when they came out with their upper and asked if they were going to offer it in a "Slick Side" they stated there wouldn't be enough demand for one. I tried to politely point out that they did not understand their target market, obviously they didn't listen. Just plug it. LOL |
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Posted: 9/27/2017 11:02:27 AM EDT
[#14]
Quote HistoryOriginally Posted By JerDerv:
Yah but... how much do They weigh? Brian |
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NV, USA
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Posted: 9/27/2017 2:01:11 PM EDT
[#15]
http://www.opticsplanet.com/fostech-outdoors-ar-15-mg-al-alloy-upper-receiver-stripped.html
They say it takes a couple of weeks to ship, I can wait |
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Posted: 9/27/2017 2:18:07 PM EDT
[Last Edit: PursuitSS]
[#16]
Quote HistoryOriginally Posted By ar15joe:
@pursuitss Just plug it. LOL I DETEST the Forward Assist, before "Slick Side" flat top receivers were available, I milled the Forward Assist section off of a receiver and had a piece of aluminum Tig welded in, then refinished it. |
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NV, USA
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Posted: 9/27/2017 2:43:00 PM EDT
[#17]
I have been using my own versions of the builders shim kit. I have round Teflon gaskets for CGA660 regulators, I use up to 3 to reduce the chance of BCG to receiver crashes.
The Taccom rifle buffers also come with 3 aluminum spacers. Also Smoke Composites has a carbon fiber spacer tune that converts rifle length tubes to carbine tubes, 2.5 inches long and 14.6 grams. Lately I have been solving problems with my Smoke Composite early version stocks. The tube is too long, without a spacer you get the BCG hitting the receiver near the threads. So I take the rifle polymer buffer as the bottom one that the spring sits on, and use the regular polymer carbine buffer (at 0.35 ounces) as the reciprocating buffer. I cut the tip off the rifle buffer until I have about a nickels width space between the BCG edges and the receiver. |
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USA
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Posted: 9/27/2017 3:28:24 PM EDT
[#18]
Quote HistoryOriginally Posted By IMachineGuns:
Most buffer tubes are a bit long on the depth of the id hole. Ben is going to send out one of our "buffer tube builders shim kit" for the buffer tube it is to reduce over travel of the carrier it consist of three shims .07,.100, and .140. They install between the buffer tube and spring and are used limit the total travel of the carrier. They are prevent striking of the carrier and buffer tube with some buffer tube and carrier combinations. Thank you for the support Brian |
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FL, USA
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Posted: 9/27/2017 10:17:48 PM EDT
[#19]
Quote HistoryOriginally Posted By Nada-Nada:
Dumb question... how does one tell if their rig is at risk for this? |
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Posted: 9/27/2017 11:10:28 PM EDT
[#20]
Remove the recoil spring from the buffer and drop the buffer to the bottom of the tube. Then slide the carrier down on top of the buffer. You can then check for interference and distance from bolt face to the bolt catch.
Brian |
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FL, USA
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Posted: 9/28/2017 8:31:00 PM EDT
[#21]
Why does nobody make a 3 prong or 4 prong Titanium flash hider? I see the Faxon has a "slim" prong flash hider but that seems to require pin/weld? Nice weight at sub 1oz...
All the other 3 and 4 prong flash hiders are more than 2oz |
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USA
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Posted: 9/28/2017 9:32:55 PM EDT
[#22]
Quote HistoryOriginally Posted By IMachineGuns:
Remove the recoil spring from the buffer and drop the buffer to the bottom of the tube. Then slide the carrier down on top of the buffer. You can then check for interference and distance from bolt face to the bolt catch. Brian Obviously it must clear the bolt catch, but how far past it is too far? |
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Posted: 9/28/2017 9:54:47 PM EDT
[#23]
Quote HistoryOriginally Posted By Nada-Nada:
Thanks. Obviously it must clear the bolt catch, but how far past it is too far? Quote HistoryOriginally Posted By Nada-Nada:
Originally Posted By IMachineGuns:
Remove the recoil spring from the buffer and drop the buffer to the bottom of the tube. Then slide the carrier down on top of the buffer. You can then check for interference and distance from bolt face to the bolt catch. Brian Obviously it must clear the bolt catch, but how far past it is too far? |
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USA
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Posted: 9/28/2017 10:46:49 PM EDT
[#24]
I am not trying to be daft, and yes I know we are talking about a Bolt Carrier, but I don't know how you can determine that with the upper in place, and with the upper off the hammer will force it up and it is going to hit the tower.
Just looking for the right process / easy process to determine if spacers are needed and if so how many. If it's obvious, it's escaping me. Are you doing this with the upper off and the hammer removed? |
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Posted: 9/28/2017 10:56:09 PM EDT
[#25]
Quote HistoryOriginally Posted By ar15joe:
Why does nobody make a 3 prong or 4 prong Titanium flash hider? I see the Faxon has a "slim" prong flash hider but that seems to require pin/weld? Nice weight at sub 1oz... All the other 3 and 4 prong flash hiders are more than 2oz |
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USA
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Posted: 9/28/2017 11:02:44 PM EDT
[#26]
I am in the market for a light weight linear brake, like a simple threaded device made of Ti. If anyone wants to make one.
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Posted: 9/29/2017 5:14:45 AM EDT
[#27]
Quote HistoryOriginally Posted By Nada-Nada:
I am not trying to be daft, and yes I know we are talking about a Bolt Carrier, but I don't know how you can determine that with the upper in place, and with the upper off the hammer will force it up and it is going to hit the tower. Just looking for the right process / easy process to determine if spacers are needed and if so how many. If it's obvious, it's escaping me. Are you doing this with the upper off and the hammer removed? |
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Posted: 9/29/2017 11:53:44 AM EDT
[#28]
I tried but I could not stay away from this thread.
I am building a lightweight SBR with a Faxon pencil 10.5 barrel. What stock tube are you guys using? Also, this will be my first go around with a reduced weight bolt carrier and adjustable gas block. What should I use for spring and buffer? Thanks |
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WA, USA
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Posted: 9/29/2017 12:17:54 PM EDT
[#29]
Quote HistoryOriginally Posted By jekbrown:
Yeah, a Ti version of the Rousch short 4 prong would be pretty sweet. If you want Ti and a FH, the best option might be the DSA enhanced A2 Ti FH. 1.25oz isn't horrible. |
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Posted: 9/29/2017 2:10:42 PM EDT
[#30]
Quote HistoryOriginally Posted By hollowhandle:
I tried but I could not stay away from this thread. I am building a lightweight SBR with a Faxon pencil 10.5 barrel. What stock tube are you guys using? Also, this will be my first go around with a reduced weight bolt carrier and adjustable gas block. What should I use for spring and buffer? Thanks  if you haven't checked it out already, there is a link in my sig to the Parts Weights Database. Lots of parts option in there... it's helpful for selecting parts.
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Posted: 9/29/2017 2:12:03 PM EDT
[#31]
Quote HistoryOriginally Posted By JerDerv:
I'm running a dsa ti A2 and it works very well. They added a few cuts that seem to help keep the flash down even more than a standard A2. I removed material off the back of the flash hider until it was clocked correctly at the right amount of torque this way I don't have the added weight of crush or peel washers. |
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SC, USA
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Posted: 9/29/2017 4:26:01 PM EDT
[Last Edit: pscot468]
[#32]
Quote HistoryOriginally Posted By hollowhandle:
I tried but I could not stay away from this thread. I am building a lightweight SBR with a Faxon pencil 10.5 barrel. What stock tube are you guys using? Also, this will be my first go around with a reduced weight bolt carrier and adjustable gas block. What should I use for spring and buffer? Thanks |
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FL, USA
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Posted: 9/30/2017 2:46:14 PM EDT
[#33]
Quote HistoryOriginally Posted By Nada-Nada:
I am in the market for a light weight linear brake, like a simple threaded device made of Ti. If anyone wants to make one. The Griffin Armament taper mount stealth flash hider, AAC Blackout in Ti etc |
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FL, USA
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Posted: 9/30/2017 8:15:18 PM EDT
[#34]
The reason I am interested in the 3 or 4 prong design in Titanium is that it ranks the highest in flash suppression and supposedly directs the blast more forwards than other designs that are more similar to the A2 cage designs.
Flash and blast are both high on my 11.5 inch although my first go round with the V7 extended/grooved A2 style did not show as much flash as I expected. About as much blast = huge! Scared the crap out of the guy a few booths down. |
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USA
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Posted: 9/30/2017 10:33:45 PM EDT
[#35]
Quote HistoryOriginally Posted By ar15joe:
The reason I am interested in the 3 or 4 prong design in Titanium is that it ranks the highest in flash suppression and supposedly directs the blast more forwards than other designs that are more similar to the A2 cage designs. Flash and blast are both high on my 11.5 inch although my first go round with the V7 extended/grooved A2 style did not show as much flash as I expected. About as much blast = huge! Scared the crap out of the guy a few booths down. |
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FL, USA
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Posted: 10/1/2017 5:34:01 PM EDT
[#36]
Quote HistoryOriginally Posted By SOCOM76:
Funny because that reminds me of a lowlight course that I took with an BCM Recce 11 Pistol. End of the course, the instructor asked me to bring a standard length rifle the next time. What flash hider / muzzle device were you using? Pics? |
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USA
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Posted: 10/1/2017 7:00:28 PM EDT
[Last Edit: SOCOM76]
[#37]
Quote HistoryOriginally Posted By ar15joe:
@SOCOM76 What flash hider / muzzle device were you using? Pics? BCM Recce 11 Mine is much older with the magnesium KMR: 
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FL, USA
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Posted: 10/1/2017 7:37:32 PM EDT
[#38]
So just got back from the range tuning the 2A Ti Adjustable bolt carrier group.
Setup is 2A Balios Lite V2 upper, Spikes LW 11.5 CHF barrel. V7 extended Grooved A2ish Flash/comp. 2A Aetheon 10 inch rail. 2A ALU barrel nut, BAD LW Ti gas block, Carbine length gas tube. Tegra lower, GSD-C Flat trigger, Seekins ambi. 2A bolt catch. 2A Ti pins. 2040g total weight with RM01 on ADM qd cowitness mount (no irons) Using a Maxim PDW Brace with the shorter buffer tube and standard spring/buffer. Adjusts as follows - Vertical line = wide open line at 3 oclock/ 9 oclock = closed gas Using Federal 233 green box 55gr M193 I tried the 2:30 position and that would not lock back on the last round on a Window PMag Tried the 1:00 and settled on the 1:30ish position Question - this system has quite a bit of flash and blast. Also recoil impulse is strange- pushes to the left? I have the Muzzle device timed correctly AFAIK... Question - can I reduce the recoil by removing the weights from the buffer and tuning the gas down? |
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USA
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Posted: 10/1/2017 9:00:17 PM EDT
[Last Edit: SOCOM76]
[#39]
In my experience, far less gas is needed to compress a reduced power action spring and reduced mass buffer. According to my shoulder and general physics, there is less recoil under those circumstances.
I also make it a point to tune the system with the weakest ammo I can find, which is generally Tula and PMC, or something I develop at home. That way, going forward, just about any ammo will cycle the action. From there, I like to see about 500 rounds worth of fouling in the action without a stoppage. |
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Posted: 10/2/2017 7:47:06 AM EDT
[#40]
Quote HistoryOriginally Posted By pscot468:
Depends. If you're looking for the least recoil and the least wearing option for your carrier use a reduced power spring. Wear is only really an issue with aluminum carriers or overgassed systems. 2 good options for RP springs are the old wolff RP spring or a nemo 300 blk spring. The nemo has the advantage of being the lightest carbine spring available. The patriot commercial size polymer buffer tube is the lightest weight 6 position tube, the lightest metal one is the pws mod 2. If a fixed stock is ok then there is really only 1 option. The smokes composite buffer tube/stock. A taccom lightweight 2 piece buffer is a great choice too. I ordered the PWS buffer tube and backordered the Nemo spring. What about buffer? Just a standard carbine one? |
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SC, USA
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Posted: 10/2/2017 4:59:15 PM EDT
[#41]
Quote HistoryOriginally Posted By hollowhandle:
Thanks guys for the help so far. I ordered the PWS buffer tube and backordered the Nemo spring. What about buffer? Just a standard carbine one? |
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SC, USA
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Posted: 10/3/2017 12:35:03 PM EDT
[#42]
Well i got my 300 blk 6.5 in lightweight build up and running!!! I'm using the echo ar II trigger, maxim brace, standard maxim shortened buffer and spring, iron city black diamond bolt carrier with RCA adjustable gas key, built on a fostech receiver set, v7 upper and lower parts, and a 6.5 in v7 barrel with a 5 in kaw valley keymod handguard. It's very nice, accurate, lightweight and most of all fun!!! I did a few mag dumps today, got 800 RPM and it was flawlessly reliably once i tuned it.
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Posted: 10/3/2017 1:14:11 PM EDT
[#43]
Finally assembled my upper, thanks 2A for the awesome receiver set, went together super smooth.
All I need is a wml and this one is done!  Attached File |
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WI, USA
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Posted: 10/3/2017 4:24:12 PM EDT
[#44]
I have found the Taccom light weight buffer system with the Strike industries flat wire spring works really well for my 2 rifles. One is piston driven with Superlative arms piston kit, the other is a syrac ordinance adjustable gas block.
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FL, USA
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Posted: 10/3/2017 6:36:47 PM EDT
[#45]
Quote HistoryOriginally Posted By pscot468:
Well i got my 300 blk 6.5 in lightweight build up and running!!! I'm using the echo ar II trigger, maxim brace, standard maxim shortened buffer and spring, iron city black diamond bolt carrier with RCA adjustable gas key, built on a fostech receiver set, v7 upper and lower parts, and a 6.5 in v7 barrel with a 5 in kaw valley keymod handguard. It's very nice, accurate, lightweight and most of all fun!!! I did a few mag dumps today, got 800 RPM and it was flawlessly reliably once i tuned it. what position do you have your gas set at? Please give feedback on the fostech receiver set? |
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USA
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Posted: 10/3/2017 6:50:42 PM EDT
[#46]
Quote HistoryOriginally Posted By themagikbullet:
Finally assembled my upper, thanks 2A for the awesome receiver set, went together super smooth. All I need is a wml and this one is done! https://www.AR15.Com/media/mediaFiles/108746/IMG_2448-323472.JPG |
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Posted: 10/3/2017 8:52:43 PM EDT
[#47]
Quote HistoryOriginally Posted By SOCOM76:
Nice to see so many SBR's and serious-use rifles built on lightweight receivers. How do you like the TriggerTech? Quote HistoryOriginally Posted By SOCOM76:
Originally Posted By themagikbullet:
Finally assembled my upper, thanks 2A for the awesome receiver set, went together super smooth. All I need is a wml and this one is done! https://www.AR15.Com/media/mediaFiles/108746/IMG_2448-323472.JPG |
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USA
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Posted: 10/3/2017 11:48:54 PM EDT
[#48]
Quote HistoryOriginally Posted By themagikbullet:
Why not start light before having to add ir laser/illuminator etc. 
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SC, USA
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Posted: 10/4/2017 9:14:23 AM EDT
[#49]
Quote HistoryOriginally Posted By ar15joe:
@pscot468 what position do you have your gas set at? Please give feedback on the fostech receiver set? |
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FL, USA
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Posted: 10/5/2017 10:47:16 AM EDT
[#50]
Quote HistoryOriginally Posted By jekbrown:
Indeed. Anyone that didn't plan on using a BFA could also lathe off the ridge of metal for that to help drop some weight too. adding to my LW 11.5 pistol build Troy Fixed Front HK style sight - 42g magpul m-lok poly rail section (3 slot - smallest avail?) 5.35g m-lok hardware for magpul rail section - 6.36g (two bolts two mlok nuts) TLR-4 light/laser (circa 2006?) - 80.1g |
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