For reasons of geography (Massachusetts), I’m building a shockwave, and probably eventually a short barrel shotgun, from a brand new, never assembled, never had a stock or barrel on it Virgin Model 500 Receiver. I plan on buying the 514 barrel and Magazine kit and a raptor grip brand new. My question is mostly about the internal components. I’m considering used components to save a few bucks. Any components I should bite the bullet and buy brand new? Will I run into problems getting components out of an older shotgun and using them in a brand new receiver? Any problems with mixing new and used parts? I have built Several ARs, but info on building a 500 seems scarce. Anything else I need to know about assembling a 500 from scratch, such as things to loctite or anything else?