Up for sale is a polymer Mk23/Usps. I have no idea what this gun is or who makes it, it has no trades, and I've had multiple buddies of mine take a look and nobody knows. It is green gas, non-blowback with a double action trigger. It does shoot, but sometimes the trigger wont reset, I figured it would be a good gun to fix up for all the mk23 lovers. Just testing the waters trying to figure out what it is. Let me know what you have!