PROOF Research PR15 PXT 6mm ARC 16" AR-15 Barrel

PROOF Research's PR15 is their AR barrel line, and this one is a 16" stainless steel barrel in 6mm ARC with a 1:7.5 twist. The PXT name covers PROOF's rifling geometry, which rethinks conventional twist progression by cutting the rifling lead angle down so the bullet eases into the bore instead of slamming into it.

The practical results PROOF claims for that geometry are lower engraving force, less throat erosion and a longer service life, along with less felt torque during firing so the rifle tracks straighter under recoil. Pair it with 6mm ARC, a cartridge built to give an AR-15 sized action real reach, and you have a barrel aimed at shooters who want more range out of a carbine length gun without moving up to a large frame rifle.