If your marker is cocking and firing fine on factory settings leave ur lug along. Its quite a big allen key and make sure your marker is not cocked when u try to screw it.
The Mq valve replaces your hammer spring, hammer, valve, pin, valve spring and cocking rod with a solinoid
So instead of a solinoid tripping ur sear, release the hammer, hammer smacks the pin and that opens the valve. Its just a pure electronic operation of the valve opening. Then you front solinoid will move the bolt only as it doesnt have to recock the marker.
Hence...lighter, faster, less kick and lower cocking pressure.
The slik stuff is just uber light, talk to skeet for prices but its theee shizzle for a cocker.