Strike Industries recently introduced their Dual Folding Adapter which allows you to stow the folding stock in either direction depending on which button you push.
The adapter fits a Picatinny interface which has become common with piston driven systems, and locks in place via two locking lugs.
When stowed, there is a positive lock so the Strike Dual Folding Adapter remains folded. It is unlocked via a man upward pull on the bar near the hinge and then back. A 3-degree down tilt angle is added to help prevent interference with the weapons ejection port when folded to the right side.
Additionally, there is an optional cheek riser.
www.strikeindustries.com/si-fsa-dual