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I had assumed that the Markerlight's ability to increase a squad's BS when firing wouldn't work with Snap Shots, but on further review of the rules I'm not entirely convinced that is the case. The relevant wording is as follows:

Snap Shots

If a model is forced to make Snap Shots rather than shoot normally, then its Ballistic Skill is counted as being 1 for the purpose of those shots.

Markerlight

To allow a unit which fires at the target to do so at +1 to its Ballistic Skill. This effect may be stacked, allowing a Ballistic Skill up to a maximum of 5.

It seems to me, Snap Shots don't strictly modify a models Ballistic Skill, they simply treat the model as though it was BS1, regardless of what it actually was (much like Unwieldy and Initiative 1), I would argue this overrides anything which modifies the model's Ballistic Skill, bad luck, it's simply counted as BS 1.

However, the Markerlight doesn't strictly modify a model's Ballistic Skill either, rather, it modifies the Ballistic Skill used for a certain set of shots, it simply allows them to fire using a value other than their Ballistic Skill, whatever that is.

So it seems to me that these two rules interact perfectly, Snap Shots reduce Tau BS to 1, Tau can use Markerlights to increase the BS they use from the modified value of 1.

Does this seem correct?

You always apply addition/multiplication modifications before set modifications, so it would be (for example)

BS 3 ->BS 4 (due to markerlight) ->BS 1 (due to Snapshot)

Happyjew wrote:You always apply addition/multiplication modifications before set modifications, so it would be (for example)

BS 3 ->BS 4 (due to markerlight) ->BS 1 (due to Snapshot)

Right, I get that, but my impression from the markerlight rules is they don't modify your BS at all, the unit simply fires at a higher BS than the one they actually have.

+1 BS is still a modification to the BS...

I could see an argument when you use a networked markerlight. Since with a networked markerlight you have to roll that before the rest of the unit the modifications are already set. For example;

Unit fires in overwatch-- BS goes to 1
Marker drone fires markerlight and hits
Unit uses markerlight to boost to BS 2.

I would argue that this works becuase the boost at a second modification step. You're already set to BS1, you fired a shot, now you can modify again.

With normal markerlight though, you've got nothing in snap shots because of multiply/add/set rules.