1911 barrel, Fusion Firearms "Ultra Match Grade" (UMG) 1911 Gunsmith fit, wilson/nowlin ramped barrel blank. Completely Manufactured in the USA from 416R Certified Stainless steel(eddystone verified, Rifle grade), Precision button Rifled, Hand honed and Air-gaged bore, all precision cnc machined and manufactured with basic fitting points on the back of the hood and bottom of feet, so that most folks with a hand file can precision fit for lock-up and superior accuracy. These barrel blanks are precision machined to a basic bull barrel diameter is .696" which is standard for all Colt Style Bull barrel configurations. 1:10 Twist Ratio. The 9mm barrel blanks come in 6.120&rdq Mfg: Fusion Firearms