Use a solvent like mineral spirits. Submerge the bolt in it to soak for a day or two. Use a pipe cleaner or similar thing to break up whatever grease is left inside the bolt cavity for the firing pin. You have to get it all out and something that is dripped in or sprayed in just won't do it. You need agitation too like the scrubbing action you would get with a pipe cleaner. Even a probe like a long skinny screw driver blade would do.
LDBennett
LDBennett
