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.