The AR-STONER 350 Legend Heavy Contour Barrel is the perfect upgrade for your rifle, or a completely new custom build. This 350 Legend is a hard hitting caliber that makes you stand out from the crowd. The heavy contour barrel makes this barrel look good while the 1 in 16" twist keeps the rounds hitting their target. This barrel features a .346" bore with a .355" grooves. Features:Chambered in 350 LegendHeavy Contour Barrel.346" bore with .355 grove