I got a .357 sig barrel for my 4046 from bar-sto before they stopped making them. It works like a champ! Swap barrels, add a heavier spring for the .357 and voila. Point of aim differences are not that bad and one day I'll switch to Novak adjustable sights and that will be that. A perfect 2 caliber gun.

I think it would be a great idea for the 10XX series but what about magazines to handle the shorter cartridge length of .40 S&W and 357 sig?

+1 on the .30 Luger 39XX BTW!

/c