I know there are a lot of good, strong adhesives, but when gluing a gunstock, I like to use those that are intended for gunstocks, for the makers of those understand the adhesive will be used outside, AND be subject to sharp recoil. I confess, though, of my ignorance about whether or not epoxies that are not specifically marketed for gunstocks are suitable. So I liked the old Brownell's Bedding Compound, and Brownell's Acraglass.
I am probably a victim of marketing hype, but I worry about some of the adhesives, especially those that when cured which are also brittle, or may become more brittle at very cold temps. I thought that Elmer's or Titebond seemed so, but as I stopped using them for guns many many years ago, they may have improved formulas.
LD