The Brownells 733 C7 Upper Receiver, a classic reborn! Featuring an 11.5" lightweight "A1" profile barrel, 1-7 twist, C7 upper with shell defector and a CAR handguards, the Commando is a unique entry into the AR-15 series. It is a mix of old school and new school, a transition from the M16A1 to the M4 platform of today. The 733 C7 includes enough modern features to make it a viable "go to" setup, especially for those seeking a carry handle receiver. The A1 rear sight nestled in the C7 upper receiver, is known for being extremely robust and dependable. The C7 upper, originally only found on Canadian AR-15 models, is a blend of the M16A1 and M16A2, being e Mfg: Brownells