The grappling gun.
Batman not only used a gun, he killed criminals rather than bringing them to justice.
Canon
If you mean fully functioning, canon, as in gun... my dad had the smallest about 3 years ago. The entire canon sat on a quarter (with room to spare!) and used black powder.
To not kill, and to not use a gun. Batman has repetitively broken both, but he does his best.
Someone looking to purchase a flash gun for a canon could find one at any camera and electronic shops. Best Buys, Walmart, target and Sears are all good retail stores to check for a flash gun for a canon.
Well he did kill himself with a gun so he used a gun at least once.
The Railway gun the Germans used to shell Paris in WWII
Canon refers to a set of works deemed significant or authoritative within a particular field, such as literature or music. Cannon, on the other hand, is a large artillery gun or a type of explosive device.
the difference in the ancient catapult and a canon are that the canon is more of a gun and uses gunpowder where as the catapult usesrope as a booster to sling the rock!
last time i did it, batman stopped me, he punched me in the heel, gosh it dug right in. My guess is its a batman ray gun to KILL batman
Isn't it kind of obvious, it is to allow him to use it twice before reloading.