M4 HIGH VELOCITY VALVE
M4 LOW VELOCITY VALVE
M4 1 3/4″ BUFFER SPACER
M4 3/4″ BUFFER SPACER
M4 AMBIDEXTROUS SELECTOR SWITCH
MICRO LINE REMOTE WITH SLIDE CHECK
FLIP UP SIGHTS
FOLDABLE VERTICAL HANDLE
M4 VELOCITY LOCK
M4 TANK ADAPTER
M4 UPPER RECEIVER COMPLETE