The Colt LE6933-EPRCK Upper Assembly is used on the LE6933-EPR and R0933-EPR Commando Enhanced Patrol Rifles. This upper receiver allows for a free-floated barrel and also features a full-length Centurion MLOK Handguard. The barrel is Colt's standard 11.5" chrome lined M4 barrel with an A2 flash hider up front.