by
jason,
Verified Owner
from IN, United States
Written on August 13, 2025
I tried this and the FM heavy bolt with 308 flat wire spring and neither one of them had any effect on reliability for the PSA Department of energy 9 mm pistol. My next plan is the Maxim roller delayed blowback system. That doesn't work I'm done with it. Don't waste your money on either one of these items if you're trying to make a PSA Department of energy 9 mm pistol caliber carbine reliable it will not work
Pros:
- Nice product would probably work in a different application
Best Used for:
- Best suited for 10-in Barrel or greater. Will have no effect on anything under 8 in Barrel
Would recommend: No
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by
Jr P,
Verified Owner
from IL, United States
Written on February 21, 2021
Nice and heavy weight buffer well haven’t tried it but got my order in 4 days that’s nice especially with Covid and I order from other websites and they take weeks good s@&$ optics planet great service but back to the buffer i recomend it seems nice and solid and that nice stainless steel color
Would recommend: Yes
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by
Will,
from NC, United States
Written on December 7, 2020
This is a quality piece. It is well made and fits perfectly. Beautiful chrome stainless steel and slick as snot. I'm using these in two Colt smg clone builds and both run flawless. Well worth the money.
Would recommend: Yes
1 of 1 found the following review helpful.
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by
Mike T,
from IA, United States
Written on January 23, 2019
Basic extended heavy buffer for blow back AR pistol, does its job sans a fancy logo with a fancy price to match. The buffer is as long as it needs to be(unlike this review) without the need for spacers or a stack of quarters.
Would recommend: Yes
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by
Tony T,
Verified Owner
from MD, United States
Written on July 22, 2018
This is my second AR9 buffer and this one is not operates flawlessly, but is three times cheaper than the previous one I purchased from another vendor. The Guntec buffer slowed the cyclic rate down perfectly and made follow on shots smooth and easy. This brand will be my go-to from now on. With regard to the overall purchase - lesson learned, shop at Optics Planet first.
Pros:
- Price
- Quality
- Fit and finish
- Function
Would recommend: Yes
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by
Mackie,
from MS, United States
Written on July 5, 2018
Works great with my FM9 upper, runs flawless. Was running a lighter buffer and it would not engauge the ejector. Swapped to this heavier buffer and it fixed the problem. Would highly recommend this to anyone having failure to eject problems.
Would recommend: Yes
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