I have one of these for sale. I have fired about 50 rounds with it. It works great, I just lost interest in it. These are sold at Midsouth Shooters Supply and their website probably has answers to most questions. I should emphasize: it is used, not new, but in very good condition. If someone is interested, I will take some photos of the actual upper. Upper must be picked up in Newnan or shipped at buyers expense.