All I can add is DON'T get the one from Brownells , it a steaming pile. When you try to tighten the screws that attach it to the stock they just go right through the butt pad. Shortly after I bought mine the negative reviews started flying in.
If you want function look at the Shooters Friend Slip on gel pad, other than that check out Midway USA they have quite a few aftermarket recoil pads or other Hide Vendor's chime in.