ACTUALLY, here's a perfectly good piece of advice for you, but requires some literal "hacking" to the rifle itself.
**Definition of a Pistol Grip: A grip that [b]protrudes conspicuously below the action of the gun[/b]. What that means is, if you put your firing hand up flush with the trigger gaurd, and the bottom part of the pistol grip protrudes below your hand (which it does), then that is considered a "pistol grip".
Many people have done the following: Take a saw of some sorts, and cut off the bottom 2" or so of the pistol grip. While you have just manhandled part of the rifle there, replacement pistol grips (if ever you want to replace it in the future) are fairly inexpensive, you can still get a good grip on the rifle if you really squeeze your hand up into it, and you are then free to put whatever type of folding or collapsable stock you wish on it, assuming the overall length is still legal. All adds up to how much you want that stock on there...
Jewbroni~