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Old February 25, 2018, 12:35 PM   #1
Sneakerh3ad
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Join Date: September 20, 2017
Location: Las Vegas, NV
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Which AR9 PSA lower is compatable with which Upper from NFA?

i have a PSA AR9 lower that i want to complete. It accepts the glock mags. My question is will any New Frontier Armory ar9 complete upper that accepts colt and glock mags will work with the psa ar9 lower that accepts glock mags?

Does anyone have any recommendations besides a PSA and NFA complete ar9 glock/colt upper?

thanks for your help
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Old February 25, 2018, 02:52 PM   #2
marine6680
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Join Date: July 24, 2012
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An AR 9 is not a standardized spec... There is no garantee, and even unlikely that two brands can mix and match... And work reliability.

Best bet is to stick with PSA uppers.
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Old February 25, 2018, 05:53 PM   #3
weblance
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The area of concern with 9mm uppers, and lowers, is the relationship of the hammer and bolt. If the bolt is ramped on the bottom rear, it should work with any hammer. I'm pretty sure everyone who manufactures 9mm bolts now ramps the rear of the bolt at the bottom.

I am using a Ruger Elite trigger/hammer in my CMMG MK9 carbine. The hammer is not a Mil-Spec design, but has a large notch where it contacts the bolt. Because the CMMG bolt is ramped, everything works as intended.
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