In an earlier post I said Limbsaver part #10701 would fit the Gen I Knoxx Spec Ops stock and it wll NOT. Sims and Blackhawk both told me it's the correct pad, and sent me one, and it did not fit the stock. I sent Sims customer service an email explaining this and requested the correct part number, so I can order the pad again. The one pictured on Blackhawk's website appears to be the correct one (no bosses on the contact surface, it should be smooth). The one I received has two bosses on the contact surface that goes into two holes machined into the stock. When I get a good part number and know the pad fits correctly I'll post my findings.