I bought a custom rifle with a Manners Ultra Classic stock and Impact Precision action. The stock was easily the lightest I have owned. However, even with a 22 inch 2B contour barrel and a 28 oz scope it was also the most unbalanced, muzzle heavy rifle I had ever had. There also wasn't enough meat on the stock to allow me to install a swiss arca plate on it for use with my tripod.
I think if you search the forum you'll find a few stories of folks who had various issues with their extreme ultralight stocks, including installing studs for bi-pods/ slings. All I'm suggesting is that there are trade offs in going with the ultra light stocks and they are not all created equal so you might want to consider more than just the weight # in your search.
In my case, I swapped out the Ultra Classic on the rifle mentioned for a Manner EH1 because the extra 10 oz gave me a overall package that met my needs better.