Crafted from the best materials, either certified 4150 MIL-SPEC steel or 416R stainless, each barrel undergoes rigorous quality controls before QPQ finishing and final inspection. Once finished, each barrel is examined for proper headspace using precision custom hardened gauges.NOTE: Faxon Firearms barrels are chambered to SAAMI specification .308 Winchester at a nominal headspace depth (passing Go and failing No-Go).Features: DPMS compatible Chambered in .308 Winchester with a 1:10 twist 416R stainless steel Rifle length gas system Heavy profile Fluted 5/8x24 thread pitch Gas seat diameter: 0.750 QPQ nitride finish 5R button rifled Magnetic particle inspected nickel Teflon LR-308 barrel extension 11-degree target crown Weight: 2.4 lbs