someone used to make a bore guide that replaced the bolt.
you just slid it in place and turned the 'handle' down where the bolt handle would go.
it kept all the gunk out of the action pretty good.
Bore guides fit in the action. Muzzle crown protectors , fit/slide on the rod and protect the crown.Bore guide, I asked what it is and yet I have two, one for each end of the barrel. I just don’t use that term.