Just my opinion, but here it is, free of charge of course. A shotgun is meant to be a shoulder fired weapon, and is at its best when used that way. Unless you are going to be using it at extremely close quarters, I don't see a lot of value in the pistol grip only option. The idea that a shotgun doesn't need to be carefully aimed is a myth. At very close quarters, a good pistol and the knowlege of how to use it would serve you better. As I say, just my opinion...you will get others that are diametrically opposed, but this is my thinking.