Lost my first muzzle guide and the next arrives in a few days. The gun arrived several weeks ago (first Garand) and the bore is very bright/shiny. If you slowly insert the short brass piece and avoid rubbing it against the muzzle, does the polymer rod's shaft sometimes have enough tiny particles to scratch the muzzle enough to influence the shots at 100 or 200 yards? I've never shot beyond 100, but might try some at 200: might not achieve the skill to be in a Garand match. Is it best to skip any attempt at cleaning residue from sixteen rds. and wait for the bore guide?