BUSHMASTER AR-15 RED DOT SIGHTS NO FURTHER A MYSTERY

I am not referring to "just lubing it below and there". They need that shit on the lookout cleaner than when it had been refreshing out in the FN manufacturing unit.This is what I was seeking. I'm considering preventative upkeep. I know the parts will very last for a longer period, but I like to switch in advance of becoming a problem. Once I get a