ORIGINAL: Zugunruhe
I've got the plain jane Kodiak, my stock looks just like MOArcher's on the inside. There are several reinforcing "webs" (for lack of a better word) that I think really lend themselves to being filled with epoxy/JB Weld to increase strength and rigidity.
As long as there is no way for the filler to flow into the area the spring and ramrod go, then you should have no problems. I think your stock and Mo Archers are the same as mine in construction. I don't have mine with me, but I think I could fill the compartments on the sides without any worries for the interior.I think no other ML rifle out there, with a synthetic stock,has more support for recoil as my Apex does or Kodiak will havewith these modifications.