Thanks guys. That information is good to know. Regarding sights I have a nice little Hawke Panorma EV 3-9x40 with a 25mm tube and sunshade on it at the moment, but its sort of overkill so I was thinking of trying a Burris FF3 reflex sight. This would make an ultra compact and light weight little short to medium range rabbit gun.
Here it is at the moment with a 12.5" barrel plus 1" thread and crown protector. I have a 'Sky' blue Boyds SS Evolution stock but I'm thinking of swapping it for the more original wood and grey laminate 'pepper' version. Either way the stock will need milling out a little by the gunsmith.
I was going to have a muzzle mounted SAK suppressor fitted but I'm rethinking, I may go for a larger overbarrel suppressor. But with the latter, to keep the whole unit just over 12" (our legal minimum), the barrel would be a touch longer, probably 8". Would this risk powering standard velocity to much do you think please?. I'm guessing not as Remington Thunderbolt (standard velocity) is sometimes only just above and mostly just below the speed of sound from the 12.5" barrel. Thanks