Maruyama MP9 Rotor Preorder the button sits closer and

the button sits closer and limts the amount of travel of the catch overall

-All hardware is included excluding bonding adhesive (JB Weld recommended)

Modification is required of the hammer to install the rotor

-Includes all hardware needed to install: npas housing

I would encourage you to complete this piston by buying Bavtechs Brass piston to complete this

Maruyama MP9 Rotor Preorder the button sits closer andThe Maruyama MP9 is known to have issues with the hammer cam after a few thousand rounds of cycling. This rotor is a replacement for that cam that will increase reliability. Modification is required of the hammer to install the rotor. Heat treated 17 4 stainless steel Increases reliability Modification required for install