thaddeus, a few timers have a 3 sec. contdown & a beltclip. To start shooting have the timer on your belt/strongside - push the start button & be ready to rock !
Features also incude a display for previous shots, so yo can go through a few mags & then go back & reveiw your times.
For a quick look, go to a newsagent & browse the gun mags...
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"The Gun from Down Under !"