OK, to make that clearer........

The FL piston/sleeve is an ABC (or whatever OS calls it) and the manual explains the breakin the same as they do in the .46AX manual. The FL would have a plain piston, no ring.

And after further checking (I ALMOST BROKE MY OTHER LEG!!!! running up and down them stairsteps!!!) the Surpass ring is listed in parts number sequence with the other Surpass parts. I'd guess it was a "normal" ring for that displacement.