Has anybody had any experience with the knoxx breachers grip?

Well, without a stock, follow-up shots, handling, and your ability to aim down the sights take a hit. The recoil goes everywhere instead of into your shoulder and you don't have the benefit of a cheek weld. Unless you're actually using a shotgun for breaching, you'd be faster with a more traditional stock.

If you are using this as a breaching shotgun, it'd do the trick. But for double the price of a normal pistol grip, I don't know if you get double the functionality. For my money, a $30-40 basic pistol grip or something like this would be better:

http://www.cabelas.com/product/Shooting/Firearm-Co...

I dont have any experience with that one, but I have the knoxx spec ops stock on a 870 and i hate it. Ive been looking for a pistol grip for my AOW, since i cant put a full stock on it, and so far i plan on going with either the pachmayr grips or the speedfeed broomhandle type.