I have a Remington 11-87 SPS 12 ga. and a Remington 870 20 ga. I want to make one of these into a "Tactical" shotgun. I hunt more with the 11-87 and would rather do the modifications on the 870. The only thing is, is that I am unsure of how the 20 ga. would be for HD. Is there that much of a difference between the 12 and 20 when using it for HD. The only real advantage that I can think of for the 20 ga. is that it would be easier for my wife to use if she ever would, or had to. But she also has a .357.