As far as Ares products go, I got one of their piston kits a while back, (2005) and I haven't had an issue with it. Shoots any ammo I run through it, whether it be brass or steel, laquered or not. So far about 15000 rounds no problem. Just to give you a perspective on their quality control.
"Democracy is two wolves and one sheep voting on what to have for dinner.
Liberty is the well-armed lamb contesting the vote." - Benjamin Franklin