Fits the Sig P320 Compact, X-Carry (minor fitting may be required on some X-Carry models), and M18 (will not fit the X-Compact). Easy to install drop-in design. Retains Loaded Chamber Indicator cut for M18 to allow interchangeability among P320 variants. 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 11 degree competition 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. Improved overall fit from OEM with added chamfers, improved radius cuts, and other additions for a better than OEM barrel. Light fitting may be required for some X-Carry models.