Faxon AR-15 5.56 Pencil barrels have a narrow O.D. both fore and aft of the gas block, for maximum weight saving. AR-15 5.56 Pencil barrels are manufactured at Faxon’s ISO-certified facility from one of the hardest materials on the planet, 4150 CMV carbon steel, featuring a QPC black Nitride or FDE coating for superior wear-resistance and longevity.

Models available for use with carbine- or mid-length gas tubes

.625" O.D. at gas shoulder accept low-profile gas block 1” long or less

Will not accept standard-length front sight block

1-8" twist rifling to stabilize the entire range of common loadings

Muzzles have ½” x 28 threads

All Faxon AR-15 5.56 Pencil barrel feature M4 feedramps for to aid in reliable chambering and extraction of round, and they must pass magnetic particle inspection to ensure consistent quality.





Big Book Catalog, Issue:72, Page:026