Unknown brand gas blowback Mac 11. silencer is full metal and detachable, stock is extendable. I haven't used this in a while, but the last time I did, the gun fired fine. The gun works but the magazine is in unknown condition and may have a leak. I used this with green gas. being sold as is, I am getting out of the sport and don't have a way to test the gun. shipping available but not included in price - US only.