I'm tossing the idea around of building my first shotgun. I plan on using an 870 Wingmaster Supermag (I have a friend who might part with it for cheap) and putting a Dominion Arms 12.5" (takes 2 3/4" - 3" shells) barrel on it. I've read many threads about this subject but can't find one that talks about the supermag. Will this setup fit without gunsmithing? Will I need a different bolt?




















































