I will not disagree that a shotgun with pistol-grip only is not as easy to use as one with a full stock or (my favorite) pistol gripped full stock, but I haven't had as much trouble as some of you guys. Maybe it's because I was using the Pachmayr pistol grip, which is quite heavy, and helped with recoil. You can use the sights to aim with it, you just have to hold your elbow close to your body, tucked into your side. It works well. Another thing that REALLY helps is the pistol grip forearm as well. Great snake gun.
But as Icopy says, he wants a folder for space saving. I like the Choate folders myself. They make a great top-folder that I'm considering for my Winchester Defender, then there's the Choate side folder, which would probably work better with the Mossberg safety. Choate stocks are just like Butler Creek stocks, with a plastic coating on the entire piece for "looks".
I think they're worth a look for you.