Basically unused RBU - it was only mounted for about a week and the gun was never fired during that time. I did, however, damage it a little during installation. I was using a polymer covered hammer to tap it into place and I didn't realize it was cutting the polymer and the steel insert was hitting the mount. I filed the rough edges down, touched it up with a black sharpie and mounted the RMR without issue. The bad spots did not effect it being mounted at all. Asking $90 shipped OBO. Payment by Paypal gift or add 4% to cover the fees, or USPS money order. No trades. Email is the best way to contact me.