I have been thinking about the ridiculousness of this rule, and think I may have come up with their ass-backwards reasoning. If you have just a pistol grip, the logical place for you to shoot it at Hot Wells, considering their setup, is at the pistol range. That's likely to lead to you (hypothetically) tearing up their target stands. If you have a stock on it, you'll be forced to shoot it either from the bench at the 25 yard range, or on the skeet range.
There's something in the water at that place, I tell ya.
Clue me in here, I've never heard of a High Definition Shotgun? Are the holes crisp and easy to see?
If you had a pistol grip and a stock could you shoot your gun? Get your folders now you will be fighting for them soon.