This used 17 Design and Manufacturing Lower, with a Geissele Upper, a Faxon Bolt, Radian Raptor charging handle and Magpul hardware. This is a unique quality built rifle in excellent condition. It has a few cosmetic blemishes from previous attachments (shown in photos) but mechanically this rifle is ready for the range. It has a threaded carbon barrel making it ready for a suppressor or brake of your choice.