WTS: Hahn Precision AR mag block with bolt hold open (bolt hold open only works with Colt mags). Can also be used with modified Uzi mags. $175 shipped to the lower 48.
It's new, purchased for a project which never got off the ground.
I'll work on getting a picture up tonight.
Email is best, as I can't get to ARFCom from work.
Thanks for looking