[Hammerslagger]

First, if one are not already a NFA taxpayer, I do not recommend one becoming one. You get you name on a list (or another list) of persons to be watched very closely. But, each to his/her own opinion relative to such.

Second, I agree with Alpo relative to barrel length and hammers.

Third, very short tubes do little to make shot spread; and shotgun shot or buckshot spreads a lot less than commonly believed at indoor distances that are commonly encountered. Do some tests of your own with a cylinder bore gun.

Forth, several newer (post 1960 design) SxS shotguns do not have their tubes soldered or brazed to a center rib. The tubes are joined together at the breech and muzzle. The center rib is just cosmetic. Thus, you cannot simply cut the barrels to make them shorter. They will have to be rejoined at the muzzle, which is usually a gunsmith job.