I don't know him, but I do know the architect that was helping to to redesign that place. The guy built the "Bunker" stuff completely off grid. No permits, no structural engineers, no nothing. They will have to get the entire structure evaluated and repaired before it can be used again. I am...
https://www.maglula.com/product/hk-g36-5-56-223-benchloader-30rd-loader/
https://www.maglula.com/product/steyr-aug-ar15-m16-m4-5-56-223-benchloader-30rd-loader/
Looks like these.
My father passed away a few months back and I am cleaning out his basement. I could fill a 55 gallon drum with all the misc. nuts, bolts and screws. But hell he was 80, so he had been collecting for some time. :)