Brownells AR-15/M16 Barrels feature 5R button rifling and are machined from 416R gun barrel steel for a superior shooting barrel. These .308 Winchester DPMS pattern barrels feature a Black Nitride finish, for superior lubricity and corrosion resistance (24” barrel is stainless steel). Barrels have a 1-10 twist, for excellent performance with a wide range of bullets. Available in 14.5”, 16” and 18”, 20” and 24” lengths. Gas systems vary by barrel length and preference. 14.5” barrel has a carbine length gas system, while 16” & 18” barrels have a mid-length gas system. 20” & 24” barrels have a rifle length gas system. Muzzle is threaded for 5/8-24 and the gas shoulder accepts .750 gas blocks. Opposite side of gas port features dimples, so that gas block set screws are secured in place, preventing movement.
AR-15, Issue:10, Page:016
Sinclair, Issue:5A, Page:248