Check the listing for details. True Precision 9mm/380 Micro Comp Pistol Compensator - 1/2x28 (Gold TiN). Color: Gold, Condition: New. Listed at 49.99 USD. Features:Fit most 9mm and .380 barrels with 1/2x28 TPI. Tension lock o-ring for hand-tight installation to prevent back off*.Made from USA-sourced solid 316L Stainless Steel bar stock.Designed, assembled, and machined in the USA.The multi-port design includes three slotted 90-degree ports with a tapered front crown to direct gasses away from the muzzle and reduce felt recoil. The overall length is .787".Outside diameter at widest: .745", with a taper to .650" at narrowest (barrel end). Available in our popular PVD and Nitride colors!*Optional use medium hold thread-locking compound for semi-permanent installation. Specifications:Caliber: 9mm / .380Length: 0.787"Diameter: 0.745"Weight: 0.5 oz**Please note that due to the effectiveness of our brakes it is recommended that you use a lower spring rate (or spring force) on your pistol's recoil spring. See your local gunsmith for proper installation.