If the one we have in the beta is indicative of how this weapon type will perform, they will rarely ever be used. I'd like to see more stability while under fire as well as bullet magnetism while under fire because, as they currently stand, they are useless even at long ranges if you even take the smallest hit.
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Yes, right now I don't see a reason to use them over a sniper, decrease charge time, less flinch and maybe more ammo.