Ken,
I cut some material off my MkV bolt knob, the part that hit my finger when shooting off the bench. I cold blued it; it works and looks great. You can't see any difference from the side.
If PB hadn't gone bunkers, I'd post a picture. The round part of the bolt knob that used to touch my finger is now flat, giving a quarter inch of so more clearance, bolt knob/finger.
That wouldn't be a bad idea on a big boomer like yours.
DF
