This Colt LE6920 M4 Carbine would make an excellent base for a clone build. It has M4 Feed Ramps, T marks on top of the upper receiver, has “C” stamped markings with the Cerro Keyhole Forge marks, "C" MP marked 16" barrel, and no QR code on the lower. Additionally, it has a Griffin Armament M4SD II Compensator at the muzzle and an ElZetta ZFH1500 Flashlight front sight post mount with a light already installed. Either can be easily be removed if preferred. This LE6920 was made prior to Colt's acquisition by CZ and has actual stamped roll marks instead of laser engraving. This would be ideal for a M4A1 Block I, Block II, Mk18, CQBR, or Mk12 SPR clone build.