I will be very happy if I can shot 8" group at 100 meters.

Here in Argentina we have to register al gun (but muzzleloaders).
In shotgun you have to register barrel lenght because we have diferent categiries according to its lenght.
+60cm civil use.(also .22LR rifles and revolvers up to .38 Spl.
38 to 60 cm condicional civil use (de same as high powder rifles and pistols).
less than 38 cm only law effocement and military use.

To cut my barrels more than a couple of cms I have to ask permition.
That means time+$$$$ if the RENAR ever let me cut it.

To get to cilinder part of the barrel I have to cut more than 3".
I do not know what to do yet.
Probably cut a little after reboring the choke to cilinder.

Thansk
Martin