This guide details the installation of the AR57 upper receiver assembly onto a standard AR15 lower receiver. The AR57 utilizes P90 magazines for the 5.7x28mm cartridge, offering a unique carbine conversion. The process involves replacing the buffer assembly and pinning the upper to the lower, with the bolt being a simple blowback design. The video emphasizes the unregulated nature of the upper receiver kit and its appeal for those seeking a 5.7 carbine.
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