A club in my area has an annual BUG championship.
This year's had 13 stages, each with 5 rounds from the BUG.
Two stages called for your FSG (Full Size Gun),
two supplied a rifle, one supplied a shotgun, one supplied a shotgun AND you shot your FSG in addition to the BUG. There was meant to be another shotgun stage, but the ammo supplied would not shoot reliably so it was a case of abandoning an unserviceable gun and going straight to the BUG.
Lots of fun and valuable experience with your little gun under competition stress.