I have a lightly used (come hundred rounds) stainless steel Double Diamond 40-9mm threaded conversion barrel. That I'd like to trade for a non threaded conversion 40-9mm barrel that's of similar value. It was $159.99 brands new. No crazy colors like a bright red, blue, purple, etc. stainless, copper/ bronze, black, gold etc. Are like what I'm looking for. The thread protector has a little bit if surface rust as it isn't stainless but the barrel is.