.45 Caliber Round Blank Barrel by Krieger Barrel, Inc.. These barrels are well known for their match winning accuracy. These single point cut rifled chrome moly barrels are cryogenically stress relieved and hand lapped. Dimensions are 1.3" in diameter, .450" Bore and .458" Grove, and 1-17" twist rate. These will finish up to a 30" long barrel.