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9mm PCC Glock mags (Page 2 of 2)

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9/1/2026 10:09:36 PM EDT
[Last Edit: m499][Edited] [#1]
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Originally Posted By 32ACP:
At the moment, I’ve committed purchases to the blowback.  I remain confused about the metric-shit-ton 9mm buffers &thought the 5.6oz one I posted, which seems NOT Colt…but I digress…but the current bolt & buffer thinking of 22-24oz of reciprocating mass is going to be….noticeable.
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You could also put one of the Maxim Defense roller delayed 9mm buffers in there...  Most reviews say it gets your blowback 9mm pretty close to the fabled MP5 recoil impulse without the added weight of the GRS system.

https://www.primaryarms.com/maxim-defense-roller-delayed-buffer-9mm-ar15-carbine


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9/2/2026 3:07:16 AM EDT
[#2]
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Originally Posted By m499:


You could also put one of the Maxim Defense roller delayed 9mm buffers in there...  Most reviews say it gets your blowback 9mm pretty close to the fabled MP5 recoil impulse without the added weight of the GRS system.

https://www.primaryarms.com/maxim-defense-roller-delayed-buffer-9mm-ar15-carbine


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Ammo is key with the Maxim buffer; fast powders and heavy bullets are crazy soft.
9/2/2026 8:59:57 AM EDT
[#3]
I tried one of the Maxim Defense roller delay buffers in my DD PCC and, while it worked, it took so much force to pull the charging handle back manually that I quickly gave it up and went back to the original buffer and spring.
9/7/2026 7:29:48 AM EDT
[#4]
I built my 9mm PCC using a Stern Defense adapter for Glock mags, and standard AR15 upper and lower parts. It runs just fine.
Using the adapter, I have the option of going back to a standard AR15 by replacing the upper, the buffer, and removing the adapter.
The adapter for Glock magazines has been problem free. I also have one for Beretta mags, and I have had some issues with it. But, I think I just don’t have it adjusted correctly yet.
From my research, I found that the recommended bolt/buffer weight was about 21.5-24oz, I’m using 21.9oz, and it runs well. But, that’s for my setup. YMMV.
9/7/2026 7:57:46 AM EDT
[#5]
Quote History
Originally Posted By Sailormilan2:
I built my 9mm PCC using a Stern Defense adapter for Glock mags, and standard AR15 upper and lower parts. It runs just fine.
.
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QFT.   I have built a couple of AR9s.  One with an adapter for Colt stick mags and a second with a dedicated PSA AR9 lower.  Both ran just fine with nothing more than a heavy buffer.  Perhaps not as soft shooting as some of the fancy builds being discussed but nothing extra to fail either.
It’s better to keep your mouth shut and appear stupid than open it and remove all doubt.

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9mm PCC Glock mags (Page 2 of 2)

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