Related Clues:

• Engine speed, for short
• Bullets and such
• Opposite of idles
• Guns, as an engine
• See 49-Down
• Subject of illicit trade
• Shooter filler
• Military group
• Quip, part 4
• This puzzle's theme
• Guns, in a way
• Weaponry
• Rotations, in garages
• Shot, e.g.
• Rounds, say