You don't see very many players using it as their primary, but there are a couple of us who are focusing on those headshots as the means of killing.
Raise your hand, handcannon user and let's hear a "I'm your huckleberry."
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Honestly, they could use a little tweaking. During the Beta, I felt like they were just slower Scout Rifles with lower ammo capacity. If they did any extra damage I didn't notice. I did enjoy using mine for a time though, I hope they make it a little more plausible as a primary. I'm (almost) your huckleberry!