My Knight's Armament monolithic upper receiver (a "theoretical" piece that doesn't actually exist but is technologically feasible), seen on a few examples of my M5 piston carbine. Turns out the HK417 flash hider makes a great stand-in for the KAC QD flash hider.
Left is the basic weapon in 14.5" and 10.5" bbl, the other is the same thing but "tacticooled" and with a different rear sight.
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"Everything is impossible until somebody does it - Batman
RIP Kevin Conroy, the one true Batman
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