I've had an FAC for years and just been through a renewal (got everything I wanted

For the first time I asked for, and got, a coterminous SGC as well. My thinking is, if I see a really cheap Sec2 semi-auto shotgun I can now buy it on my SGC, change the mag tube to Sec1 and then put it on my FAC.
Anyway....my SGC question is.....
I can't see any restriction on the SGC regarding how many shotguns I can have or what gauge they can be. Can I now just buy as many Sec2 shotguns, in whatever calibre I fancy?
Cheers
David