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When you make attacks with this ability, roll dice to hit separately from other attacks.
For each successful Sniper hit, you may choose which specific unit in the target formation is actually hit — either before or after the target player allocates regular hits. Of course, your choice is subject to the usual limitations, such as range and line of fire — and subject to whether or not you took into account the cover to hit modifier, if appropriate.
Also, the target units you choose suffer a -1 save modifier against these hits.
FAQ
Q. Can the Sniper ability be used in an assault?
A. Only where this ability is noted for Assault Weapons or Small Arms. With either weapon type, you can target any enemy units within 15cm and in the line of fire of the unit with the Sniper weapon.
Q. When do we allocate Sniper hits?
A. Before or after regular hits but before the target player makes saving throws (and thus before allocating Macro-Weapon hits).
Q. Can a Sniper hit be allocated to a unit that has already been allocated a regular hit?
A. Yes.