Originally posted by CJ
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![](http://upload.wikimedia.org/wikipedia/commons/4/4f/DIRECTM16.gif)
![](http://upload.wikimedia.org/wikipedia/commons/9/93/PISTONM16.gif)
The benefits of a piston are that they run cleaner, cooler, and are generally thought of as more reliable as evidenced in the army's own dust tests-
![](http://www.murdoconline.net/2007/dust_test_graph-thumb.jpg)
DI is however lighter and considered to be more accurate by internet warriors such as myself.
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