One final topic to address before I actually post.

Abe's poisons degenerate non-organic material faster than organic. At Tier-5 this would eat through the barrel of the gun and cause it to break up, clog, or otherwise ruin the gun.

An M16 with a blockage has a very violent backfire, and would destroy the gun itself without much collateral damage. 

Video evidence cited: 
[url=http://www.youtube.com/watch?v=Oh1lyMyejpI] Here [/url]

Are you aware of both of these facts?