I placed an order for an upper, bolt group, charging handle and lower. When I placed the order, all items were listed as ‘in stock’. I did receive the upper and bolt. However, I have not received the lower or charging handle. I have made numerous attempts to contact Aero precision regarding the status of the remainder of my order. I have placed many phone calls with a total of many hours on hold without any answer of my call. I realize inventory changes. But this has been for months now. I am disappointed with the lack of communication from Aero Precision. I WILL NOT order from Aero Precision again.