I already have a 12 gauge shotgun (8-shot Winchester Defender) for HD with an 18 inch barrel and a 12 inch LOP stock. I am considering adding a pistol grip 'stocked' (Speedfeed 'Birdshead' grip) 12 gauge shotgun (w/18 inch barrel) to my collection that would be strictly for indoor HD usage. I would probably want a Remington 870, or maybe a Mossberg. If I were to make it a Mossberg, which model(s) are better in terms of reliability and smoothness of the action? Also, any general thoughts on even the need for such a weapon would be appreciated greatly.