About: Clever name, right? Nah. Anyway, first shot shoots one barrel, second shot shoots the other, then reloads. Lather rinse repeat. Each shot only uses one ammo instead of two now. Alt fire will fire old style.
Protip: Great for conservative ammo users.
Compatibility: Skulltag, other stuff. Doom II.
About: The Doom II supershotgun sprites and sounds with just a snippet of DECORATE, and voilà! Double barreled Ultimate Doom. Might seem a little out of place for just fighting imps and zombiemans though.
Protip: Good for any Doom I deathmatches.
Compatibility: Skulltag, probably everything else. Uhhhh, Doom I.