This SIG SAUER factory replacement barrel is designed for the P365-XL and P365-XMACRO (non-compensated models), fitting the 3.7" slide assembly and extending to 4.3" with 1/2x28 threading for mounting a suppressor or compensator. Machined and heat-treated to Sig Sauer's dimensional tolerances, it's a genuine OEM upgrade that drops in with reliable factory-spec fit and function. The barrel retains the factory Loaded Chamber Indicator (LCI) witness hole, letting shooters visually confirm a chambered round without racking the slide. It carries a rugged Nitron finish that adds surface hardness and corrosion resistance for reliable feeding over extended use. A thread protector cap is included to cover the 1/2x28 threads and keep them clean and undamaged when no muzzle device is installed. Sig Sauer P365 9mm 1/2x28 4.3" Loaded Chamber Indicator Barrel 8902058