As with all Faxon Barrels, the Faxon Rimfire line is made in-house at our Cincinnati facility from raw bar stock, and undergo the same rigorous testing and quality control measures that have made our AR and pistol barrels a market favorite. These barrels are made from 416-R stainless steel, given 6 Groove Rifling at a 1:16 twist, and a Recessed Target Crown. Barrels are Magnetic Particle Inspected, and are finished in either Salt Bath Nitride or PVD. All Faxon Rimfire Barrels are backed by the Faxon Lifetime Guarantee. Specifications:Barrel Caliber: .22 LRBarrel Chamber: .22 LR SportingBarrel Profile: Straight Fluted Bull ProfileBarrel Material: 416-R StainlessBarrel Weight: 2.2 lbsBarrel Length: 16Barrel Twist: 1:16Barrel Finish: NitrideRifling: 6 GrooveTarget Crown: RecessedCompatibility: 10/22, non-takedownMuzzle Thread: 1/2x28Diameter: .920