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I think we were on the same page Happy, I was just having problems explaining my thought process in a well understood manner. I agree with the answers they gave to your four questions.

I'm still confused as to what people think. I've added a poll to help clarify.

The answer is other. If the model firing has Relentless or similar rule then 12". If not, 6".

Sorry, I thought I was clear in the example that the hypothetical squad didn't have Relentless. (That's why I didn't use grav-cannons in the question, since they always have Relentless. ) But. thanks, nonetheless.

"This has the effect of reducing the range of enemy units wishing to fire at the vehicle by 6". ... The extra distance is also counted for working out if the vehicle is in rapid fire range, half range for a melta shot, and so on."

Salvo weapons have a fixed range - 18" in this case. It is reduced by 6" by night shields, then halved for moving with a salvo weapon. Exactly as you would for say a rapid fire weapon.

Total range vs a vehicle with night shields after moving = (18" - 6") / 2 = 6".

Alright lets look at this from a melta weapon point of view and maybe it'll clear something up.

Multi Melta - Range of 24"
Night Shield - Reduce Range by 6"
Multi Melta - New Range of 18" and Melta Range of 9"

Melta Gun - Range 12"
Night SHield - Reduce Range by 6"
Melta Gun - New Range of 6" and Melta Range of 6"

You can't reduce the range of a weapon below 6" per the Night Shields rulings.

Grav Gun (Salvo/Stationary) - Range 18"
Grav Gun (Salvo/Moved) - Range 9"
Night Shield - Reduce Range by 6"
Grav Gun (Salvo) Range 12"(moved) Range 6" (moved)

Dastrike wrote:
Melta Gun - Range 12"
Night SHield - Reduce Range by 6"
Melta Gun - New Range of 6" and Melta Range of 6"

You can't reduce the range of a weapon below 6" per the Night Shields rulings.

Melta range would be 3". The weapon range is still 6" as per your rule, but you still need to halve for melta.

My view on the matter is 6, the order of events has been clearly explained in this post and they are accurate as the max range of the weapon is not changed when you do something that calls for half of max range. Yet I can see where the argument of 3 is coming from, even though I find it faulty it is still based on the rules telling you how you go about modifying the rolls in relation to these sort of rules. What I am curious about now is the reasoning from the two people whom voted for it to be 9 inches...?

 grendel083 wrote:

Dastrike wrote:
Melta Gun - Range 12"
Night SHield - Reduce Range by 6"
Melta Gun - New Range of 6" and Melta Range of 6"

You can't reduce the range of a weapon below 6" per the Night Shields rulings.

Melta range would be 3". The weapon range is still 6" as per your rule, but you still need to halve for melta.

I see what you are saying, I guess that part derives from the area I play in and agreed on that we can't even reduce the melta below 6". In a tournament though I would give it to the TO for the call.

Dastrike wrote:

 grendel083 wrote:

Dastrike wrote:
Melta Gun - Range 12"
Night SHield - Reduce Range by 6"
Melta Gun - New Range of 6" and Melta Range of 6"

You can't reduce the range of a weapon below 6" per the Night Shields rulings.

Melta range would be 3". The weapon range is still 6" as per your rule, but you still need to halve for melta.

I see what you are saying, I guess that part derives from the area I play in and agreed on that we can't even reduce the melta below 6". In a tournament though I would give it to the TO for the call.

Melta range and weapon range are two very seperate things.
According to the rule you posted, only the weapon range has a 6" minimum.