FM Products FM-9 AR 9x19mm Parabellum Rear Charging Upper Receiver 5in Barrel 4in Handguard w/ Blast Diffuser Black

FM Products FM-9 AR 9x19mm Parabellum Rear Charging Upper Receiver 5in Barrel 4in Handguard w/ Blast Diffuser Black. The monolithic style has been achieved with a proprietary interlock between the upper and handguard. The slim-line handguard is M-LOK compatible for your favorite accessories. The Foxtrot Mike Products 9mm Upper Receiver comes fully assembled and ready to drop on any pistol caliber lower receiver that uses Glock magazines. With its full-length Picatinny top rail and M-LOK compatib