Factory replacement threaded barrel designed and tested thoroughly for the P365 chambered in 9mm with a 3.1 slide assembly. Works on P365 and P365-X 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 and P365-X models. This is not compatible with the P365-XL P365-XMACRO or P365-FUSE slide assemblies.