I've been using the Khvostov in PvP and I gotta say it's actually really fun. Nice and simple, no quirks or kinks to worry about, just point and shoot.
EDIT: Wow. Just tried the same thing with the default armor. Noticeably more difficult. I think I'll try again later.
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It's the best gun. It's just a wonderful simplistic weapon. Too bad you can't turn it in for a refurbished version.