Special Purpose Rifle Contour Barrel.
M4 Feed Ramps come standard. 1:7 or 1:8 twist
This barrel comes with M4 Feed Ramps, MID, Intermediate Length or Rifle gas system, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar.
Chamber type and Finish is your Choice.