I was to cheap to buy one so I made one. The butt of the stock is cradled in a sort of a cloth sack and placed against the shoulder. I've used it with my 470 double and my 9.3x74 o/u and both regulated shots just fine. It really takes the recoil away, but of course is only good from the bench. If you shoot much heavy stuff, it's a good investment. (also easy to make one)