The Foxtrot Mike Products FM-9 Complete 9x19mm Upper Receiver is feature rich and cutting edge. This configuration is an AimSurplus Exclusive. Built from the ground up to provide outstanding reliability and accuracy with a host of top tier features. 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. Features an Ultra Light 5 in. Ultra Premium, Match Grade Barrel. Includes Ultra Premium Bolt Carrier Group and Breek Arms Warhammer Ambidextrous Charging Handle. Works with both Glock and Colt Magazine style lowers. This model includes Blast Diffuser and Thread protector.