Blast pistols are 6" range. Even firing two, you've got to get in mighty close, and even two doesn't give me enough certainty to try it. Let's say you hit with them both, then roll a two and a four for armour pen, that's two hull points off, assuming no save, and one roll on the pen table. Statistically speaking you're only busting the tank once every three attempts. And the rest of the time he's getting shot, a lot, in the following phase.
The model would look amazing though.
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