Honestly I think you'll find out that it's more cost effective to buy a used browning clays gun like a 425.The thing with over/under shotguns is they are built with precision and made to last 3+ generations.My shooting buddy has a 425 that's got more than 500 thousand through it.I've got 200k through my beater citori which I use for sporting clays/skeet/hunting.All that said your best bet for stock fitting that I know of would be John Zeppa,his shop is at Sunnydell shooting grounds in Sequim.I'd venture a guess that 99 percent of his work is double gun related.