Sorry for chiming in late and I'm no smithy but are you considering a heavy buffer? Again sorry if already brought up but my rifle seems to run the bolt back and forth pretty fast. Maybe a heavy buffer would slow the action down a tad? .... Experts?
After that move called ?( monster?? ) she scares me!! I'm glad my instinct was correct over my other instinct !! Hahah penn never had a chance in my book.