They can also work on "standard weight" pre-'64s, if you remove the forend screw.
Have also removed the forend screw on a few occasions back in my stock-making days, when I restocked a few pre-'64s. One belonged to a good friend who's a pre-'64 nut, a .270 that shot well. I asked him if he wanted the forend screw in the new stock, and he said no, not necessarily. So I full-length bedded the stock with a "skim" of Acra-Glas, and it shot better than it did with the original stock and forend screw.
