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This article explains how to use the Mine Launcher.
The Mine Launcher is Gadgetron's version of Vox Industries's Hunter Mine Launcher. It is used by shooting a mine that homes in on the closest enemy. There are two mods therefor one that creates a fire where it explodes and one that creates three mini-bombs when it explodes.
A good place to upgrade it are the exercise yard arena challenges, but just make sure your not hit by the cannons. Another good place to upgrade it is the prison break arenas because they are a lifesaver when it comes to stop prisoners.