this was profesonaly installed because normal this gun can not take an hpa unit. before I had it it was a show gun for a shop. the reason it was no longer being used as that was a customer dropped it and caused the charging handle to be stuck in a single position. probably fixable if you bend it back. asides from that there are a few holes in the reciver from the old gear box mount. asides from those two cosmetic issues it's great. parts list: a&k mk43 mod 0 440$ asg mk43 mod 1 handguard 50$ polar star fusion engine m60 500$ bull gear cnc hop up 75$ madbul steal bull 6.01 40$ barrel work ( flat hop and lap) 50$ gunner sling 25$ that's just about 1200 dollars not including the instalation of the p* I'm open to trade but you are shipping first unless it's heavily in my favor. no more than 2 gun in the trade please I don't need 10 wombat guns. 800$ is what I'd like to get. and that's fairly firm. I'd keep it for less. no hpa rig included. shipping is going to cost you. this thing weighs like 20 pounds and is huge to be properly boxed. so expect at the least 50 bucks in shipping costs. located in nc