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Posted: 7/9/2018 11:44:35 AM EDT
[#1]
I have no experience with any of the components you are using. However, don’t overlook Toolcraft for your BCG. They make BCG’s for many of the companies out there that simply put their name on it. You can get Toolcrafts in a wide variety of coatings too.
Toolcraft BCG Click Shop Online and it will take you to Cryptic Coatings for whatever finish you would like. Black Nitride or Phosphorus coating will run $110. Some of the other coatings start jumping the price considerably. |
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Posted: 7/9/2018 12:18:41 PM EDT
[#2]
Thanks for the info, I’ll look into them.
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Posted: 7/9/2018 12:55:17 PM EDT
[#3]
Good info on bolts and buffers here:
https://www.ar15.com/forums/AR-15/AR-PCC-Barrel-Bolt-Buffer-Database-what-works-/15-728777/ and here: https://www.ar15.com/forums/AR-15/9mm-AR-buffers-/15-728974/ FWIW: I am using a Faxon Gen.2 and a Geissele Super 42 buffer/spring combo. Works fine. |
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Posted: 7/9/2018 12:57:21 PM EDT
[#4]
Thanks Mr_Maim!
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Posted: 7/9/2018 1:29:38 PM EDT
[#5]
I don't think I would try and mix delayed blowback (CMMG) and direct blowback (MA) parts. The BCGs are very different and may cause issues. FWIW I have two PCCs (9mm and 45ACP) built on the CMMG upper/lower/BCG/barrel and they have so far worked flawless with less felt recoil. I sold my direct blowback PCC after shooting the CMMG as I felt the CMMG would be a solid upgrade.
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Posted: 7/9/2018 2:30:21 PM EDT
[#6]
OIF, thanks. That’s what I was afraid of, the bolt not really working with non CMMG lower. I don’t want to spend the coin and then have to mess with it to get it working, if it would work at all.
I already have the MA lower coming in. Reading further into these threads, it seems a hydraulic buffer like the Blitzkrieg with an AR10 Carbine spring can smooth out the impulse. Thanks for the feedback. |
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Posted: 7/9/2018 11:28:13 PM EDT
[#7]
Guard upper is only compatible with guard lower ....unless you are willing to extensively modify mags , and mag adapter/lower
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Posted: 7/10/2018 8:23:12 PM EDT
[#8]
Quote HistoryQuoted:
Guard upper is only compatible with guard lower ....unless you are willing to extensively modify mags , and mag adapter/lower I read that the hydraulic buffer is very effective, although very pricey. Given your knowledge and experience, is there an effective way to mitigate recoil to decent levels without going hydraulic? |
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Posted: 7/10/2018 9:22:27 PM EDT
[#9]
I just run a standard carbine spring with our deadblow extended buffer. I don't notice recoil on the 9mm.....I can put 'em all in a pie plate at 25 yards in FA
Here is a short proof of life video on an upper I built for a Federal LEO with my buffer and a carbine spring. I have 8.5 inch barrel on the shelf and on the website along with the buffers. I HIGHLY recommend them as I get tired of recutting feed cones sometime......  Just kidding, I'm happy to do them, just wish folks would buy my barrels to start with and save the hassle 
 9mm A1 upper, customer supplied parts. |
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Posted: 7/10/2018 9:39:22 PM EDT
[#10]
Quote HistoryQuoted:
Guard upper is only compatible with guard lower ....unless you are willing to extensively modify mags , and mag adapter/lower Details are here: http://c3junkie.com/?page_id=597 |
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Posted: 7/10/2018 10:23:53 PM EDT
[#11]
Quote HistoryQuoted:
I just run a standard carbine spring with our deadblow extended buffer. I don't notice recoil on the 9mm.....I can put 'em all in a pie plate at 25 yards in FA Here is a short proof of life video on an upper I built for a Federal LEO with my buffer and a carbine spring. I have 8.5 inch barrel on the shelf and on the website along with the buffers. I HIGHLY recommend them as I get tired of recutting feed cones sometime...... Just kidding, I'm happy to do them, just wish folks would buy my barrels to start with and save the hassle
 https://www.youtube.com/watch?v=pydRMsESjykHow much of the length is eaten up by the upper? 1/2”, 1”? |
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Posted: 7/11/2018 1:39:54 PM EDT
[#12]
Quote HistoryQuoted:
Thanks for that info. Been looking at your website and I’m interested in your barrels. How much of the length is eaten up by the upper? 1/2”, 1”? |
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Posted: 7/16/2018 7:09:17 PM EDT
[#13]
The pistol is slowly taking shape. Decided to go a little shorter, went with a 5.5” barrel from Macon Armory and added a KAK slim extended flashcan. The barrel arrived today, the feed cone is nicely shaped, has a very shiny polish and feels really smooth.
An Aero Precision Atlas 7” rail is on the way. Next on the order list is the PSA pistol build kit with the SBA3 brace. 
Pics of feed cone. 
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Posted: 7/16/2018 9:34:06 PM EDT
[#14]
Cool. Good to see a solid plan coming together. Good luck with the finished build. I'm soaking up as much info as I can on these threads. A 9mm AR is most likely the next project I intend to start. Your going to love the SBA3.
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Posted: 7/17/2018 8:42:53 AM EDT
[#15]
Quote HistoryQuoted:
Cool. Good to see a solid plan coming together. Good luck with the finished build. I'm soaking up as much info as I can on these threads. A 9mm AR is most likely the next project I intend to start. Your going to love the SBA3. I’m now waiting on the rail to arrive. I decided on the SBA3 over the PDW, it is less expensive and seems to work very well from what I’ve read and seen on video reviews. Are you using the SBA3? |
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Posted: 7/17/2018 11:16:10 PM EDT
[#16]
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Posted: 7/18/2018 10:38:37 AM EDT
[#17]
That’s a great looking pistol. Thanks for the video, can’t wait to have mine done.
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Posted: 7/24/2018 2:51:28 PM EDT
[#18]
Slowly making progress.
So far the build has: Lower: Matrix Arms Upper: Rainier slick side Barrel: Macon Armory 5.5” Muzzle: KAK slim extended Rail: Aero Precision Atlas 7” mlok Brace: SBA3 Still need the bolt, buffer, lpk & sights. Looking at Macon for the bolt and buffer, PSA for the lpk. No idea on sights yet. I have an Eotech that can go on there while I decide on the BUIS. 
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Posted: 8/10/2018 2:36:08 PM EDT
[#19]
The pistol is finished and range tested. Fired about 100 rounds this morning. It was a mix of brass and aluminum cased 115gr FMJ and some Hornady TAP 124 gr. I was a little apprehensive of the hollow point rounds, but function was flawless. The Macon Armory bolt & barrel combo fed, fired and ejected everything, every time. Cycling and recoil were not too abrupt with the standard carbine spring, but I want to try a slightly stiffer buffer spring to see if it will smooth out a little. The Matrix Arms LRBHO was also flawless, the bolt was locked back every time the mag went empty. I’m very happy with how it turned out. |
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