First off, welcome to Sig Talk, from the southwest corner of Indiana.
Since it comes in both Mil-spec, and commercial diameters, and it is shown applicable to the AR-10, LR-308, and AR-15, I would think it should. To be certain call Magpul and ask.
Since you live in Arizona, and the 716 comes with a collapsible stock, pray tell why install a fixed stock? If you're trying to get rid of a little stock rattle, get the CTR stock, unless that is what you already have.