I just put a cheap ammo sleeve on pad it to suit with pipe insulation foam or fun-noodles from the pool. Put a hole in it so it goes under the rear sling stud. Moves a little but not bad.

Some have more skill and cut the comb and make adjusters simular to the option boyds has now.

I just don't like the looks of kydex on wood. Not that the sleeve is at all attractive....