I experimented with a folding stock (Choate Encore Folding Butt Stock - Stainless or Blue
) on my TC Encore 6.5x55 20" MGM barrel. It makes for a very compact package, although I had challenges fitting it nicely in my Eberlestock pack. With a 50mm scope set on med rings, the folded butt end makes the gun a bit too tall (or wide if you think about it that way) to fits nicely in the pack scabbard.
The Encore is so short normally, I end up using the fixed stock because it fits so nicely in the pack. I still like the idea of nothing sticking up out of the top of the pack, so I have ideas of a quick detach stock. One bolt mounts the stock to the frame. I just have not come up with a QD solution yet.