So I really want a Knight Armament Masterkey (underbarrel 12g shotgun) but I don't want to pay the $2k for it, or have to completely change my AR again. So I was thinking, if i got a SBS either Rem 870 or Moss 500 and attached some ARMS throwlevers upside down, it would mount on a bottom rail. I have the Daniel Defense 9.0 Lite rail. So I guess my question is, how do you think the rail/mounts would hold up to the recoil? How can I attach the ARMS to the shotgun? Can they be welded or is there a better process someone can recommend? I'm just brainstorming so feel free to throw out any ideas.