Look in the pictures for the model. Electric blowback is disabled and it has an shs metal rack piston with first 2 teeth shaved down. The charging handle is secured in there but if you pull on it, it will come out. Only because the blowback unit was disabled. It has a stainless aftermarket inner barrel however I am unsure of brand. Will need a new round fuse as I don’t have one. Shoots very far for having the stock bucking and hopup. Can provide a shooting video and I’m asking $150 shipped