Lone Wolf drop-in replacement barrel for the Glock 21 in .45 ACP, stock 4.60" length. CNC machined and heat treated from 416 stainless steel. Sold as a blemished unit - see the note below. Features Heat-treated 416 stainless steel, CNC machined Button rifled with a standard crown Standard groove-and-land rifling - safe with lead, plated or jacketed bullets, unlike a factory polygonal barrel Drop-in pre-fit - no gunsmithing required Works in both stock and factory ported configurations Manufacturer Part Number: LWD-2145N-BLEM About the blemish Blemished barrels carry a cosmetic mark from manufacturing - a finish inconsistency, tool witness mark or minor discoloration. Function, dimensions and accuracy are unaffected and the barrel is otherwise a first-quality part. Sold at a discount for this reason and not returnable on the basis of appearance. Specifications Caliber: .45 ACP Compatible host: Glock 21 Gen 3 and Gen 4 Barrel length: 4.60" (117 mm) Material: 416 stainless steel, heat treated Rifling: button rifled, standard groove and land Manufacturer: Lone Wolf Distribution GLOCK is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H. Neither 3CR Tactical nor this site are affiliated in any manner with, or otherwise endorsed by, Glock, Inc. or Glock Ges.m.b.H. The use of "Glock" on this page is merely to advertise the sale of Glock pistols, parts, or components. For genuine Glock, Inc. and Glock Ges.m.b.H products, visit https://us.glock.com . 3CR Tactical is an approved Lone Wolf Distribution dealer. Lone Wolf parts we list are genuine Lone Wolf product, not clones or salvage.