Bought an upper and magazines to go with it. Magazines are cheaply made out of tin that is so thin it move allowing rounds to pop out. Upper was not loading rounds properly and pin short striking not even contacting primer. Tried to contact company with no success. They won't answer their phone and send a generic response back to any emails. In all, absolutely no customer service at all. Returning purchase and never doing business with this company again. I would rather pay more for a company that has customer service.