Factory replacement threaded barrel designed and tested thoroughly for the P365 chambered in 9mm with a 3.7 slide assembly. Works on P365-XL and P365-XMACRO (non-comp) slides. Includes a thread protector cap when not in use with a compensator or suppressor. – SIG SAUER factory replacement pistol barrels are specially heat-treated for toughness and durability. – Thread configuration: 1/2-28 RH – Features the factory loaded chamber indicator (LCI) witness hole. – Note: Compatible with P365 models including P365-XL P365-XMACRO and P365-X models (The barrel will protrude further out on 3.1 slides found on the P365-X models). This is not compatible with the P365-FUSE slide assembly.