Seven Sins - seems appropriate for something with seven shots ( in my imagination it's some kind of downsized rocket launcher or grenade launcher. the projectiles might have an arched trajectory, so you can hit behind obstacles [and I like such weapons in games] and they should be not to powerful so the first one would not be able to kill. Like a good mix of the concussion rifle, grenade luncher and the rocket turret [because "we like rockets!"])
could be anything, though.
Sting of the scorpion (sniper rifle or revolver) or Scorpion Sting
Puma (it's of course more fitting for a vehicle ... people I would love that)
3AT 7H1S (Eat this) - any kind of weapon
BOOMSDAY device - explosive
answering machine 7 (AM-7) - any kind of weapon
English
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FYI: Puma was the original name for the Warthog in Halo :)