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I had a rules argument at a game on Friday night. My stompa took the extra Supa Rokkits and I used them to great effect. Each Rokkit has the "one use only" rule. But, the argument was; can I fire more than one supa rokkit per turn?

The Rules lawyer in the room said no, because the Rokkits were one line in the codex which makes them one weapon system which means one per turn. But we could find no such rule in the book.

Any one have a specific rule that covers this?

The Super Heavy Walker rules say that the Stompa can fire all of its weapons each turn.

If a vehicle has more than one "One-Shot Weapon", it can fire them separately in the same turn following the normal rules for the number of weapons it can fire. It's just like having multiple Lascannons (for example) - they'll be a single line in the Codex, but are separate weapons.

You won't find a rule that says you can't fire more than one, since you are given permission to fire weapons in the rules, and there is no additional restriction within the One-Shot special rule.

Examples of other vehicles where this is relevant:
The Tau Skyray, Space Marine Storm Ravens and Dark Angel Nephlim Jetfighters each have 6 copies of the same one-shot weapon. Two of those are Flyers (and so don't turn up until turn 2 at best), so they'd have difficulty unloading them all in a normal game if what your Lawyer said was true.

Another thing to consider - in 6th, Flyers were specifically restricted to only firing two Missiles a turn (this restriction has been removed in 7th) - completely impossible if he was right.

Ironclad dreadnoughts, for example, can (or at least used to be able to) take 2 hunter-killer missiles. They still can unload both at the same time .

Is the lawyer really saying that a vehicle with several weapons of the same name can only shoot one of them? That's pretty bad news for all the vehicles with sponsons then!

Each individual Missile does count as a single weapon, in the same way if you put two Bolters onto a single Model they would still be considered two separate weapon systems. This has nothing to do with how many weapons the Model is allowed to fire, that is governed by rules completely unrelated to what Weapon systems are included on the Model. If that theoretical model has permission to fire two weapons a turn, then the second Bolter can be fired along side the first for a total count of two weapons. If it has permission to fire all it's weapons... well Skyray's have been a Alpha-shot wonder for that very reason.

it can fire more than one per turn, in the same way many tau vehicles can fire more than 1 seeker missile per turn.

or many flyers can fire more than 1 missile t a turn.

As above.

You have 2 "one use only" weapons.

Not

You have 1 "Two use only" weapons.