These barrels are a true match-grade barrel, we only have one grade for all of our barrels, our best. All of these barrels are made from 1″ diameter 416 alloy rifle-barrel-quality stainless steel. Every barrel is drilled, reamed and rifled in our shop followed by a stress relieving heat treatment operation. They are then hand- lapped for a superior internal finish and diameter uniformity.

M4: .975″ diameter for 2″ then a radius down to .850″ diameter to the .750″ diameter gas block section. From the gas block to the muzzle the diameter is .725″. Barrel length is 17″ including the M4-type barrel extension and the M4 barrels are furnished with a .500″ x 28 TPI x .600″ long threaded muzzle. The gas system is carbine-length. This barrel profile is an exact copy of the Recon barrel we’ve made for the US Navy SEALS. Weight is 2.18 pounds. Engraved: Lilja M4 .223 8T”. To see a .pdf drawing of the profile – Click Here

We also offer a fluted version of the M4 in .223. The contour is the same as the M4 described above and like our other fluted AR type barrels there is a fluted section in front of and behind the gas block area except where the barrel is engraved. The fluted weight is 2.0 pounds.

M4 barrels are back in-stock and ready to ship!