It is the highest impact HC and I'm pretty sure it's a two headshot kill out of the box, if you have one with a damage multiplier (luck in the chamber, crowd control, final round) it can one shot a person. I just rolled mine this morning and I'm stoked about it, going to run perfect balance perk at least in PvP.
Steadyhand IS
Spray and Play
Perfect Balance/Snapshot/Field Scout
Luck in the Chamber
English
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2 headshots leaves them with 5-20 HP depending on their armour spec