You might want to hook up with your local bowling pin league, and try running that thing against the timer.
I think you'll find the ergos of the factory wood stock are way superior to the, uhm, accessory stocks.
Here's why- they big advantage to using a long gun in a defensive situation is the four points of contact- butt, cheek, right hand, left hand. Most of these aftermarket stocks don't give you the cheekweld that makes the shotgun such an instinctive hitter. In the dark, at speed, under stress, you won't get a cheekweld, and you're more likely to miss.
In my opinion, less is more with a defensive shotgun.