Batman: Guns 'n Death

DC Comics has built a reputation that their most iconic characters such as Superman and Batman don't kill.
The notion being is that they are better than that. They also know once you start killing you become the villain. The concept is a sensitive however it's always a passionate debate among the fans.
However it doesn't negate the fact that the idea of them doing does not go without notice.

The following are articles and examples to contemplate and such:

http://goodcomics.comicbookresources.com/2014/04/29/abandoned-love-did-batman-just-kill-that-guy/  and here http://sacomics.blogspot.ca/2005/08/batman-and-guns.html 

10 Nights of the Beast:

  

Batman Year 3:
http://goodcomics.comicbookresources.com/2014/04/29/abandoned-love-did-batman-just-kill-that-guy/

Another interesting article here that looks deep historically from the golden age to the modern age on the topic:

http://www.cracked.com/article_20111_the-6-most-brutal-murders-committed-by-batman.html

Batman Year Two. Trade paperback. Currently out of publication.

Add caption

Detective Comics 710 explains one scenario of his gun expertise training.

Top of image from Batman Year 1. Bottom of image from Batman/Planetary. The reason for Batmans hate of guns.

But just remember Batman all in all does not use guns, it's a liars weapon~!