Semi - gun fin setup

Do most semi gun designs come as a tri-fin or is possible to make it a 2+1 so it can be surfed as a single fin as well? If a semi-gun could be surfed as a single what type of fin template would work?

Over at Surfer BB toPBk just last year had a gun made that was 2+1. You might ask him how he likes it.

…I usually run smaller sides with more rake,and a center fin that’s taller,and more up right.This is in a standard tri set-up like Red-X.Herb

I agree with Herb – a move veritcal center fin, the right size of course, will keep you from getting squirrely along with letting you go rail to rail more easily and getting the drive of the raked rail fins.