most of the questions have been answerd in the above.
most set of mounts fit well on the Super10 I been using Sportsmatch & soon to be BKL mounts.
If you are after a tubed Super 10 really I think you need to be talking to Adrian Hartley (STALKER) here's a Picture of a Tiger 10 LE
here's a link to his website
I recon you'd be better off getting the completed articel of Adrian, but they arn't cheap, if you want to be diffrent it costs
but you could also get em like mine I have 2 super10's Carbine Bull Barre
& 16"a Custom 16" Bull Barrel
there are so many ways in which you can take em, what ever way you go you won't be dissapointed
Hope it Helps?
Darren