Hey all,
Been thinking about a 9mm build for a while and finally ordered a New Frontier Armory C-5 lower (accepts MP-5 magazines). I’ll be adding their upper receiver for compatibility with the mags but after that, I don’t know squat. Some I am wondering what are the go to parts as far BCG, buffer, spring, receiver extension and barrel? The build will be a pistol configuration with either a SBA3 or Tail Hook Mod 1.
Thanks in advance.
BCG - JP rifles has some of the best, second is any that copy their style… NO psa 1’s period
buffer - dedicated 9mm extended buffer (7.5 oz minimum)
spring - 308 spring works good, more money XP or wolf
receiver extension - any mil-spec tube will work
barrel - Ballistic Advantage makes some good ones
Thanks. I am trying to figure out what barrel length to go for. I don’t currently own a suppressor for 9mm but it could happen in the future so may opt for something that helps with subsonics.
I would keep it less than 5.5" for subsonic use. Suppressed 9mm ar is all kinds of fun.
I recently went through this and settled on the Foxtrot Mike setup, or FM Products as they are called. Check Primary Arms and Brownells. They use Glock magazines, but I understand a Colt magazine version is in work. I stuck with a 16” carbine, b7t they are also available with 8.5 and 10.5 inch barrels. They use a unique side charging system, and a very nice bolt hold open. They make billet receivers and a polymer receiver with metal inserts. I went with the billet receiver. I’ve got everything here except the receiver, which should be in early next week.
8-8.5" seems to hit the spot just right…
Ditto on the 16" FM upper. I just got mine back from Cerakote. The whole thing started with an EDC glock lower that fell in my lap. It was supposed to be a budget setup until I installed a hiperfire Eclipse, TACCOM 3-stage buffer, and BAD safety.
I’m already eying a quarter circle ten lower with TACCOM ultralight weight upper.
From what I have gleaned elsewhere, the FM stuff is decent but temperamental with the NFA C5 lower. I’ll stick with the NFA assembled upper (just the upper, not group) as they are local and I can get support.
A heavy A5 buffer works well for me with standard receiver extension (buffer tube) that’s with my colt magwell one and 5.5 in barrel suppressed. The longer length keeps 9mm brass out on hammer area and shortens bolt travel. I will second that JP’s 9mm bolt works well.
Since when do they have a commercial 9mm option?
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I ended up going with a BA 5.5" barrel. All I have left to buy is the BCG, buffer and spring. I have seen decent feedback on Spinta and Kaw Valley BCG’s elsewhere. Anyone experience here? I did get to check out a QC10 BCG today but at over $250, I’m having a hard time justifying the price when I don’t spend more than $200 on a 5.56 BCG.
Have built about 5 with the Spinta one with no issues, mimics the JP one which is the standard. The QC one is a JP, hence the high price tag !
Limited production/market for the 9mm BCG. https://www.joeboboutfitters.com/9MM-AR15-Bolt-Carrier-Groups-s/163737.htm I have assembled a Matrix lower and will be testing it in a few weeks. http://www.primaryarms.com/matrix-arms-9mm-glock-lower-receiver-ma9gl and yes, if you read the reviews I had to poke a drill to open up the pivot pin hole. No big deal. Little aluminum grains.
The mag release is aluminum, not plastic as the ones on my PSA lowers.
On sale 5.0oz 9mm buffer from CMMG I actually use 5.1’s in my AR47 http://www.primaryarms.com/cmmg-ar-9-carbine-recoil-buffer-for-9mm-ar-rifles-90ca9b4?trk_msg=BJ5I1LPB8MI452LD8V853C8QQG&trk_contact=75IB6QB7B8OV4AGNTE2QO0H5AO&trk_sid=7BP6A8CFHLEBGVURDTSV9ESM7O&utm_source=listrak&utm_medium=email&utm_term=SLOT_12&utm_campaign=18_07_Ad_15_Summer_Build_cali
Just got this one in the email. 5.4oz
I bit the bullet and bought the QC10 bolt (Glock) it was and still is pricey…Im glad I bought it. The QC 10 glock bolt will work in a colt style carbine as well. The bolt is built like a tank. I had an out of battery fire and the only thing that happened was the extractor blew off the bolt and the magazine blew out the bottom. I replaced the extractor and went back to business. They are expensive and with that said I bought two FM products bolt groups in 9mm for less than what I paid for the QC10 bolt. FYI the FM products Colt style bolt will work in Glock too.
I bought the Spinta BCG and of the limited rounds I have shot, around 225, seems to work. I had some feed failures with my 115gr reloads but those disappeared when I tested some factory ammo. Need to Chrono the factory rounds to mimic with my load. 147gr HST ran well. This thing is a ton of fun to shoot. Cheaper than 5.56 and easier on steel close in.
As it sits right now:
Vegas, what barrel and rail are you running?
Ballistic Advantage 5.5" 1/2x36
New Frontier Armory 5" rail
Flashcan is a KAK Slimline.
Have you had a chance to put more rounds through it? How’s it functioning? Also, how is the manual of arms? Seems it would be weird using the charging handle after a reload.