CP Control Bore Autococker barrel back 0.682 Blue Factory Spare Parts 4-Position Recreational Firing Mode Switch:

4-Position Recreational Firing Mode Switch: Safe/Semi/Burst/Full Auto

Along with everything else

Regulator Piston O-Ring

The recoil spring assembly is held in place by the slide stop levers axis pin and a round cut-out at the front of the slide

CP Control Bore Autococker barrel back 0.682 Blue Factory Spare Parts 4-Position Recreational Firing Mode Switch:This is a barrel back, and works with the CP barrel tips. Custom Products barrels go through a 9 step process on the some of the most technologically advanced and precise machinery on the planet. After it leaves the machine, each barrel is hand inspected and hand polished for a finish that is near perfection.