While we're on pump problems, I have one for you. Here is my gun;
Benchmark trigger and rail. I am using a blue bumper washer that I cut down to fit inside the wave spring.
My pump kit doesn't work with a stock wave spring and the pump power tube spacer. It literally still shoots semi with a stock wave spring. I tried 2 wave springs together, but then it doesn't always catch the bolt as it is too far forward as causes too much pressure.
Rainman229 from MCB had stretched my wave spring out quite a bit and it worked great for about 2 days, but then the wave spring slowly collapsed back to original size, causing erratic low velocities and eventually it resorted back to semi auto.
Basically I can't use my pump kit for more than a day without re-stretching my wave spring out and it won't work with a brand new wave spring at all, it just shoots semi. Any suggestions?