If you know the history of the MK18 program you know that CRANE started by cutting down 14.5 M4's to the 10.3 spec.  Will show storage marks and signs of test firing and rocksett residue on threads from removal of muzzle device.

-NEW Colt 10.3" 5.56 1/7 twist chrome lined barrel gov profile barrel .070 gas port

-HPT/MPI with an M4 barrel extension.  

-Gas Port size is approx .070

-Dimpled for MK12 gas block; includes MK12 gas block (these are rocksetted on-we will not be responsible for damage trying to remove them)

-Daniel Defense RIS II Barrel Nut

-Colt gas tube

-Please note these were cut for front sight posts previously.  If you understand the history of the MK18 barrels for Crane you know this is appropriate.  If you do not understand, please do not purchase.

All NFA/ATF Rules Apply.You may not install barrels less than 16" in length on a firearm unless it is a Registered SBR, Machine Gun, or Pistol. Possession of these barrels along with a Non-NFA Firearm is Prohibited, except when installed on a Pistol.