For those that have not seen the page, this is what 40mmpumpgun is talking about. Here is a photo and more pics and details are at the link:
http://quarterbore.com/nfa/ar10autoconnector.html
As for the AR-10 in full-auto, I have looked at my own
AR-10 and my SWD Lightning Link and I have considered doing the really minor mods to make one of my own AR-10s run in R&R mode... as pointed out, I just don't have enough hours in my day to do all I want to do...
Now, do you have a way to get a couple pics that shows one of these babies sitting in an AR-10?