I have a Magnum Research MLR 22 that I have owned for 5 years and it would not cycle reliability with standard velocity ammunition. High velocity it would run 100%. A couple of weeks ago I installed a Kidd charging handle with a Kidd recoil spring and guide rod along with one shot. It’s functioning 100% now with standard velocity. I just installed a Kidd trigger kit and it’s perfect now. I can finally love the MLR.