| LMT Monolithic Barrel Assembly CQB MRP 10.5" Chrome Lined 5.56 mm - L7MA1B Lewis Machine and Tool's MRP™ barrel assemblies are unique to the Monolithic Rail Platform system. With the proper installation wrench, an operator can customize his rifle for the mission at hand without armorer or gunsmith assistance. 10.5" CQB MRP™ barrel assembly, 1:7" twist. Designed for the CQB MRP™ upper receiver. Not to be used with the full length rifle version MRP receiver |