I used a batch of moly-coated in my 9mm. I know you guys are talking about rifle barrels, but barrels are barrels. Moly coating left a black coating in the barrel and if you are expecting to a bright shiney barrel after cleaning you'd think that your barrel was dirty, but it wasn't. I never bought any more because I didn't think it was worth the additional cost. I guess people didn't think it solved a problem.