Mike,
When you say "...flipping the barrels up..." do you mean bending?

I have straightened a set of sxs barrels that had been bent from damage. I can tell you bending a set of sxs barrels up or down is childsplay in terms of actually making the bend. The one Grulla I saw that shot very high had curved upward barrels, visually the barrels were curved. Had I known how to fix the condition then, I'd have bought that gun cheap on the spot. It was a nice 28ga.