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1.
(Variants: trigger or uptake may replace draw)

quick to respond
You have to be quick on the draw to hit the targets.
by Light Joker July 29, 2005
 
2.
To be fast with your gun,

to be a quick shooter.
My, he shot that guy down fast.

Yeah, he's quick on the draw.
by olaxiqo February 20, 2010