I purchased a pair of the seconds, the top is great. the lower, ehh. It's OK, the pin alignment was WAAAAAAAAAAAAAY off, I'm talking half of the metal is protruding in after hammering it on solid. I had to file it down (not the best idea) to get a pin even in. The stock pin will slide right out after shooting it, the extra large tension pin it comes with well holds for now from what I can see. Good luck getting it out is all I can think for cleaning. I probably wouldnt even remove it for cleaning because its so tight. These may be one of few options but I cant say I'm ecstatic. Writing these off as a poorer investment.