Newton, the M19 was made in a 3" bbl, but they are hard to come by. As others have noted, the M10 was also offered in a 3" bbl, but there is no underlug. Your other option would be to scour the dealers for a used, beat up finish, but mechanically sound M10, M15, etc. Then locate an M19 spare bbl. Send both to a good gunsmith who can cut the bbl and install it to 3" length.