SOLD I have for sale an ARMS 40 flip-up back up iron site (BUIS). Excellent condition aside from small nick in mounting screw. I bought this new 5 or 6 years ago or so, had it mounted on my AR for a couple years. Nice sight that's easy to mount on a rail, has large and small apertures. Sorry, these are the best pics my crappy camera can take. $55 shipped. I'm not able to check email or IMs every day, but first to respond with a firm “I'll take it” will get first dibs. Prefer USPS money orders but can do Paypal if you pay fees. Would also consider trades for ammo, AK74 mags, power tools, ladder.