the reason I like to keep coppies of recipts even for parts clearly marked made in USA . is just in case someone after you takes out that G2 group for a euro set and the parts count is off. at least you can prove it left you correct. lets face it you do not know who may end up with the gun after a few years. It would be easy to think someone that did not know about the count could own it and see cheap euro parts and put them in.