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FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits
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Most Helpful Negative Review Not a Fan at all
Extremely difficult to swap out muzzle devices. It has non-standard threads and the barrel is lose and just continues to spin, so you have to remove the barrel and clamp it down to swap muzzle devices. Since the threads are out of the norm, muzzle devices are limited unless you get an thread adapter.
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by Jk, Verified Owner from OH, United States Written on March 14, 2026
My foxtrot mike upper receiver is different than what is advertised! Me and a friend purchased these at the same time from optics planet. His is the genuine upper as shown in the pictures, mine is not!

My upper does not have a shell deflector, does not have a patent number on the bottom of the receiver, my muzzle device does not have the small holes at the front! And it seems my barrel is longer by a quarter inch. It’s like I received a knockoff or a previous generation upper receiver some how. comparing them side by side you can see they are totally different. Totally unacceptable.

Also upon originally assembling the parts my pistol grip was missing as well. Although they did offer to send the grip to me after an email exchange.
Would recommend: No
Was it helpful to you? Yes | No

Please read my review below.

by Jk, Verified Owner from OH, United States Written on March 14, 2026
My foxtrot mike upper receiver is different than what is advertised! Me and a friend purchased these at the same time from optics planet. His is the genuine upper as shown in the pictures, mine is not!

My upper does not have a shell deflector, does not have a patent number on the bottom of the receiver, my muzzle device does not have the small holes at the front! And it seems my barrel is longer by a quarter inch. It’s like I received a knockoff or a previous generation upper receiver some how. comparing them side by side you can see they are totally different. Totally unacceptable.

Also upon originally assembling the parts my pistol grip was missing as well. Although they did offer to send the grip to me after an email exchange.
Would recommend: No
Was it helpful to you? Yes | No

great wuality

by Romeo Valdez, Verified Owner from CA, United States Written on September 12, 2024
This came with everything you need to finish your built. Great pice and fast shipment.
Would recommend: Yes
0 of 1 found the following review helpful.
Was it helpful to you? Yes | No
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