Agency Arms 419 Compensator, Single Port, For Sig P320, Standard 1/2x28 Thread Pitch, Matte Finish, Black 419S-BLK The 419 Compensator is a thread-on compensator designed for the P320 platform. It is offered in both a dual port (2 top ports) and a single port configuration. The Agency Arms 419 Compensator is threaded with the standard 1/2x28 RH thread pitch (Overall barrel protrusion should be 0.819" +/- 0.005" for optimal fitment).