He specialized in custom Thompson Center Contender and Encore barrels, as well as custom firearms of all sorts. Barrels are listed by Part#, Caliber, Twist, Diameter, Length and Material. Barrels marked “UNK” in twist have unknown twist rates, but all barrels were rifled with commercial twist rates i. 308, 1-10 or 1-12, etc. Barrels marked “BP” are for Black Powder bullets. 410 and 20ga Rifled barrels have straight rifling. 002 deep to satisfy BATFE requirements for shotgun caliber pistols to not be classified as short barrel smoothbore shotguns. Rifling is not intended to stabilize rifled slugs. All barrels are new unfired condition. Generic photo of barrels is provided. I do not have resources to photograph every barrel. Be sure you order the barrel you want. Please use the Part #’s when ordering from the Pulldown Chart.