Remington 870 accessories for Hawk 982

[1winnen]

I'm thinking of getting a Hawk 982 but I would like to add some tactical add-on such as ProMag Archangel Tactical Shotgun Stock with Receiver Mount Shell Carrier or Blackhawk Knoxx SpecOps II Stock with Forend and Archangel 7 Round Shell Holder. I have already read that the forarm might need some inside sanding to fit properly. Has anyone had any experience in adding these items? Any suggestions, opinions and advise would be greatly appreciated. It's either add these to the 982 or just get a Winchester SXP Extreme Defender and make a couple of mofications. Thanks