Note: The posting of Copyrighted material on this forum is prohibited without prior written consent of the Copyright holder. For specifics on Copyright Law and restrictions refer to: http://www.copyright.gov/laws/ - doublegunshop.com will not monitor nor will they be held liable for copyright violations presented on the BBS which is an open and un-moderated public forum.
but I have seen them on German guns, , I thought some had rectangular through bolts, but I think now it's just the shape of the protruding bolts that is rectangular, & not the "Hole", 