9mm AR15... what to consider?

Mine feeds perfectly from my Rock River Arms 10/30 pistol mags, I just bought some 3 CProducts 5/30 and 2 10 round pistol mags off the EE, hope they work as well as the RRA mags.

I was thinking of a Lone Wolf glock mag lower but I just sold my G17 with 7 mags so I don't really think it's as good of an idea anymore. Plus the Lone Wolf lowers are hard to find lately, Questar is always sold out.
 
Colt 20/5 and 30/5 work 100% but they are big money.

RRA work early well actually same as Colt in my 9mm AR and they are 10/30 as added bonus.

IMHO you need quality mag block.. Ramped bolt and extra long Buffer to prevent bolt bounce.
 
Love my 9mm AR.

they can be finicky, but once I tweaked mine, it's been reliable and fun to shoot.

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the only mags that run 100% in mine are actually the original RRA plastic ten rounders. kinda hard to inert full, lips flare, but run perfect. i had some CProducts mags, but they were pure garbage.
 
cr5 said:
I also picked this up a few weeks ago.
I have an 8 inch barrel and the factory 16 inch.
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That is one of those guns I always wanted to try. Then I got a chance to shoot one and absolutely hated it. They are so expensive yet crude and plastiky.



Shooter1of38 said:
Love my 9mm AR.

they can be finicky, but once I tweaked mine, it's been reliable and fun to shoot.
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Mine ran perfectly from day one. Never had an issue with it. Interestingly it chews through all kinds of different ammo that some of my other guns won't.
 
Where I work, we have two 9mm AR-15s that were built from parts kits. These guns see a LOT of use. Generally speaking, they are very reliable. Ours use a magwell insert with stick mags. Occasionally the insert will need to be tightened up after a few 1000 rounds but overall things run just fine. We had problems initially with firing pins that were breaking in half, but we haven't had one break in quite a while (not sure if we switched brands or something). What we see now more than anything else are broken trigger pins and occasional springs wearing out. Our original receivers have gone through many thousands of rounds of ammunition, and experienced metal fatigue around the forward takedown pin on the upper receiver. Eventually the fatigue grew to a crack and a chunk of the upper receiver broke off completely and had to be replaced. I'm not sure what the round count was, but i'd speculate north of 5000+ rounds, perhaps near 10,000. We replaced our upper receivers on both guns to be safe and so far we haven't noticed any fatigue on the new ones.
 
Milofficer said:
Where I work, we have two 9mm AR-15s that were built from parts kits. These guns see a LOT of use. Generally speaking, they are very reliable. Ours use a magwell insert with stick mags. Occasionally the insert will need to be tightened up after a few 1000 rounds but overall things run just fine. We had problems initially with firing pins that were breaking in half, but we haven't had one break in quite a while (not sure if we switched brands or something). What we see now more than anything else are broken trigger pins and occasional springs wearing out. Our original receivers have gone through many thousands of rounds of ammunition, and experienced metal fatigue around the forward takedown pin on the upper receiver. Eventually the fatigue grew to a crack and a chunk of the upper receiver broke off completely and had to be replaced. I'm not sure what the round count was, but i'd speculate north of 5000+ rounds, perhaps near 10,000. We replaced our upper receivers on both guns to be safe and so far we haven't noticed any fatigue on the new ones.
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^^^

Magwell insert needs monitoring, firing pins breaking, trigger pins breaking, springs wearing out, uppers breaking.

Seems like they are pretty reliable haha. Brands? Parts guns? Custom builds?
 
I run a colt and it is reliable with both RRA plastic and c product 10 rounders. The firing pin broke after 2500 rounds. It still worked after the firing pin was broken. I only found that out when I cleaned it. For a while I couldn't source a new firing pin so I shot it with a broken firing pin.
 
The initial build used STI manufactured 223 lowers. I'm not sure what brand of magwell inserts were used but I'm pretty confident they were the Spike's version. 10.5" barrels, Midwest Industries 9" freefloat rail handguard. The uppers aren't branded but they do have the Cerro Forge keyhole mark on them. The two new lowers we're using are made by Aero Precision.
 
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