Sig Sauer Barrel, 9MM, 3.7 Threaded Barrel, 1/2X28 Thread Pitch, Fits Sig P365, Nitride Finish, Black, Loaded Chamber Indicator 8902059 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.