It surely would be nice to be able to just run down to the local Wall Mart snag a 100 round Value pack of Remington .40 and run a few rounds on the range with my 29. 10 mm is just to expensive to get as much trigger time with this one as I would like. Anybody do a .40 conversion here? If so can you just drop the barrel in and run the same recoil spring and mag? Wish now I had bought the 30 and then got a 10mm conversion kit. You can't go the other way so---.