You might want to run this by Mr. Bruce Gray...he's a master gunsmith (and a fantastic person), he and his team at Grayguns are famous for their work on Sig's.
His website is grayguns.com
Probably best to call him rather than rely on email.
A forum community dedicated to Trap shooting enthusiasts. Come join the discussion about targets, clays, hunting, gunsmithing, gear reviews, accessories, classifieds, and more!