This is a really cool little carbine, made by Olympic Arms back quite a few years ago. They made 320 of these, this one being number 23 (serial number is actually "USMC 23").
It came factory multicolored anodize on all of the aluminum parts, including the delta ring and charging handle.
Instead of the usual stopsign logo or lion logo, this one is engraved with the Corps logo.
This gun is in excellent contidition, but it is not unfired, or NIB. In fact, there is no box. It will be shipped with one 30rd mag.
Price is $1395, plus $15 to ship.
Thanks for looking, and sorry for the crappy pictures. I think I need to figure out how to use the macro feature on my camera.