I had a simular issue years ago. i have to carefully polish the surface area where the valve sit s back to its original anno finished height do the the tolerance space of the valve to rail height tolerances for the sear to align properly. when ever refinishing an automag hever let the base of body or under body section of mag to be stripped or recoated. Cause s lot of issue s from changing the designedspace tolerances, unless you luck out. Check out the Lukes Customs dot com website he s the pro of automag finishing ,modifacation, etc.