I guess over a case a fill is not good enough haha? I'm sure it could be done but the marker runs at 6ms already, how low would you want to go here?
I would be careful with polishing because there is supposed to be certain amounts of friction in the bolt with it's two stages and all, well according to dye. I would mess with orings, less permanent change and it has worked great for me.
Rockland Hustle AXBL Alumni ; Toronto Rage CXBL Alumni ; Rochester Rhythm Alumni ; Niagara Falls Savages USPA
Windsor Lockdown - CXBL
Syracuse Rhythm - PSP