Hello. I got an AR in a trade and it came with a Colt 14.5" upper with a 1.5" flash suppressor. I would like a 16" upper that I can legally take the flash suppressor off and put on a golf ball launcher. It has a Midwest Industries rail on it and no carrying handle. How much do you think I can get for it If I put it on here or Gunbroker or even Armslist?