An alternative that I had seen pictures, but never used - was a sling with a "loop" on rear end that snugged around the pistol grip area - idea was that while "hunting", the sling is rolled up in your pocket - only used the sling as a "carry strap" for the trip out. I have also seen leather butt cuffs with integral QD studs - so can wrap / tie that onto the butt, and have the QD stud, without drilling a hole into the stock. I think the ads for them that I saw were for lever action Win 94, but no reason same idea would not work for pump action shotgun?