Your Browser is OutdatedReviews by Pete P.
AR-9 Build
Written on Nov 25, 2025
I had an AR-9 upper and wanted to finish my build (for an M&P type). I had no issues with this dropping in and cycling with the PSA upper, the Anderson lower wearing a Stern magwell adapter.
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Works perfectly with S&W M&P mags
Written on Nov 25, 2025
I like to pair my pistols with a carbine that accepts the same mags. I could have bought a Response or FPC from Smith or a Sub-2000 from Kel-Tec (I have one, it's nice) but I had parts that included a AR-9 barreled upper and a AR lower. Talk about a perfect match. It went in easy and setting it up (the three set screws) was quick. After one trip to the range it has been flawless. It stayed secure and no issues with mags, feeding or ejecting. If you have an M&P in 9mm or .40 S&W this may be a way to add a long gun that shares mags, ammo and keeps the recoil down.
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