That's a 91 housing and that is a PSG-1 pack, but that is not the PSG-1 ejector. It looks like they replaced it with a standard .308 ejector. The only other thing that I see missing is the allen wrench for the trigger shoe. See pic below:
A forum dedicated to and laser-focused on Heckler & Koch firearms, Heckler & Koch accessories and the owners and enthusiasts that love them! Come join the discussion regarding HK pistols, long arms, NFA arms, HK accessories, HK history and trivia and more.