PROOF Research carbon fiber AR-10 barrels pair a carbon wrapped barrel with the Caliber Matched Gas System (CAMGAS), which moves the gas port to suit the cartridge and barrel length. Evolved Ballistics lists them in 308 Win, 6.5 Creedmoor, 6mm Creedmoor, 243 Win, and 22 CM, with intermediate and rifle length gas systems and a 5/8-24 muzzle thread. If you are still comparing options, browse all PROOF Research barrels or see our stainless steel AR-10 barrels.
PROOF Research
PROOF Research
PROOF Research
PROOF Research
CAMGAS stands for Caliber Matched Gas System. PROOF notes that the AR-10 was designed around the 308 Win and 7.62 NATO round, and that higher performance cartridges such as 6.5 Creedmoor keep bore pressure higher further down the barrel. PROOF moves the gas port so gas system pressure matches what the platform was designed around, and says the result is a softer recoil impulse, less fouling in the receiver, more reliable extraction, and less wear on brass.
Evolved Ballistics lists PROOF carbon fiber AR-10 barrels in 308 Win, 6.5 Creedmoor, 6mm Creedmoor, 243 Win, and 22 CM. The 308 Win barrels are listed in 16 inch with an intermediate gas system and in 18 and 20 inch with a rifle length gas system, all with 1:10 twist. The 6.5 Creedmoor barrels use a rifle plus 2 gas system with 1:8 twist, and the 6mm Creedmoor is listed in 22 inch with a rifle plus 3 gas system. PROOF lists a 5/8-24 muzzle thread on its AR-type barrels and includes the matching gas tube with the intermediate, rifle plus 1, plus 2, and plus 3 gas systems.
PROOF lists a 16 inch 308 Win intermediate barrel at 2 lb 3 oz, an 18 inch rifle length at 2 lb 9 oz, and a 20 inch rifle length at 2 lb 11 oz. The 6.5 Creedmoor rifle plus 2 barrels are listed at 2 lb 14 oz in 20 inch and 3 lb 2 oz in 24 inch. PROOF says its carbon fiber barrels are up to 64% lighter than traditional steel barrels of similar contour. For the 308 Win barrels, Evolved Ballistics' product page also recommends full mass components throughout, meaning a full mass bolt, buffer, and springs.
PROOF builds its carbon fiber barrels by wrapping a reduced profile 416R stainless steel barrel blank in aerospace grade carbon fiber with a proprietary resin. PROOF says this gives improved heat dissipation and match grade accuracy, and says the barrels are as accurate as the finest precision steel barrel. The same carbon wrap is used on PROOF's bolt-action and semi-auto barrels. If you would rather stay with stainless, see our stainless steel AR-10 barrels.
Evolved Ballistics' 308 Win barrel page says these AR-10 barrels use a deep feed system with feed ramps compatible with DPMS and Armalite style lower receivers. On the 308 Win barrel page, Evolved notes that headspace is guaranteed to the specification of the JP Enterprise Enhanced Bolt and recommends double checking headspace before you fire the rifle. Also match your gas block to the gas journal, which is .750 inch on the 16 inch intermediate barrel and .875 inch on the rifle length barrels listed here.
