I'd like to put forth the idea of a Lever Action Scout Rifle (sorry if it's been suggested before). I love westerns, I use handcannons simply because I feel like Clint Eastwood, going WahwahWahhhhhh after I headshot a group of Fallen. It feels wrong that we have something like the awesome single action Last Word without any other westernish weapons in the game. Something along the lines of the pic linked above would be awesome.
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Pro: awesome look, awesome animations. Con: takes even longer than the worst hand cannon to reload, small magazine. I'd still take one. Especially if it used hand cannon ammo AND had similar impact, just a longer scope range.