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I had a blackhawk(Knoxx) 20ga stock for the one I had, fit perfect - a good addition.
I do think the 12ga stocks fit as well, but are wider than the receiver and will look funny.
the rear of the 7615 receiver is the identical to an 870 20 gauge. 12 gauge 870 AR15 stock adapters are commonly used on them, it will overhang the receiver slightly, being made for a 12 gauge, but not so much its really gawdy looking. Any 870 pistol grip should also fit.
stripped down the fore end. found a tube the exact size to slide over the OEM one. had three rails installed and an end cap welded on. now it bolts onto the action bars.
10inch barrel custom made using the barrel extension from the 16 inch one. rest is obvious.