Reminds me of my first shotgun, a winchester defender 18" with 7 round tube. I immediatly bought a pistol grip and a pistol grip front end and I have to admit that it was the worst shotgun ever.
Recoil was pretty tough on the hands, and that was an 18" model not a 12 like in the picture. The worst were the 3" magnum loads..
Later I changed the front grip and put back the original one, made handeling the gun much better. Eventually I tossed the pistol grip and bought a full stock with pistol grip and it's WORLDS better. Recoil is much more managable, and accuracy can actually be achieved.
I will never ever again put just a pistol grip on my shotgun, it makes it pretty much useless IMO.