Zonie:
I haven't shot M/L pistol in competition, but would like to use my home-made underhammer with adjustable sights and custom grips (sculpted, sort of like a Swiss .22 free pistol's grip). Is there a category for such that you know of? If not, what categories/matches would mine be allowed in? I suppose it would depend mostly on local club rules, but perhaps the NMLRA has a ruling on this.
BTW, Robert Abels' catalog used to offer "saw-handled" duellers from time to time, mostly English made flinters.