I have one of these for sale, $100 (+ $5 shipping or free if pickup in PDX area): Troy SKD Folding Battle Sight- Rear, FBS-RA1.SKD (Black, not the DE version) New in box. I attached it to a rail so I could look through the sight picture and compare to a Troy DOA and decided to go with the DOA and boxed it back up. Never fired, never left the living room. Hence, $20 off sticker price for you. Compatible with any other Troy front sight or standard AR-15 fixed front sight posts.