there are long gripped M9's and M7's purpose made for long barraled M16's but not military. the bayonet lug is as it is a standard fitting not for use, the last thing you would want as a soldier is a long barrel on an assault weapon, kinda defeats the purpose. Most of the long barrel weapons are to give heavier barrels to allow the weapon to be used more as a light machine gun and support (for sustained auto fire). If your support weapons need bayonets you are int he s**t and the fact that the thing slops around a bit is really material.
At least thats my understanding
Of course if its a civialian weapon the bayonet stud is there to make it look good for those who want to pose!
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