Firing from the bipod makes you more accurate. You might not always be able to employ it, but when you can, why wouldn't you take advantage of the extra stability?
It's often used by SDMs when attempting longer range shots- 300+m. The Gripod (similar, but not exactly what's pictured) combined with an ACOG and a shooter who knows what he is doing makes the M4 good out to 500m, maybe more.
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