Easy to install drop-in design fits the P365 XL (3.7") version ONLY.; Advanced proprietary broach cut design specifically engineered for increased accuracy potential.; Broach cut 6 groove rifling allows for all ammo types to be used safely, including cast lead.; 100% Designed and manufactured in the USA with USA sourced certified 416R stainless steel.; 9mm 1/10RH twist rifling.; Special deep style target crown for non-threaded versions or 1/2x28 threads with included thread protector on threaded versions.; Threaded versions include Viton high heat integral O-ring lock thread protector.; SAAMI spec chamber.; Barrel Length from chamber to muzzle: 4.22"; Improved overall fit from OEM with added chamfers, improved radius cuts, and other additions for a better than OEM barrel.