Builders Special Colt M4A1 Block II Clone Upper

This is the perfect start for a clone Block II M4a1 upper build. One of the most popular builds as it allows for a pinned & weld to achieve the 16" OAL. 

-Colt 14.5" Gov Profile C MP (NEW)

-Colt Complete "C" Stamp Upper Receiver (Surplus)

-Coronet Contract Low Profile Gas Block (NEW)

-Colt Gas Tube (NEW)

Includes everything neccesary for a Block II M4A1 build aside from a RIS II Handguard, Muzzle Device, Charging Handle & BCG.