Any issues with putting UBC in an AR upper with the gas tube? Just got a RRA 18" Varmit upper and wanted to coat it before I start shooting it.
Never hurt any of mine....don't see how it could eihter, but to be careful, I make sure the gas port is up.. IE upper is upright. If it scares you, pull the sight base and tube first.
But FWIW I've coated almost all my MZ guns, and it hasn't hurt a thing there either, nipple is sorta like a constricted gas tube...