Have a used one that came off my TA31F for sale.
$29 shipped in the CONUS. No P.O. address since I ship UPS.
Accepts M.O. and Paypal plus 3.5% to cover Paypal fees.
Here is the link to my AR15.com feedback as reference. www.ar15.com/forums/topic.html?b=7&f=109&t=201424&page=1