| abstract | - The Super 90 is primarily used by police and military forces, although civilian versions also exist. The weapons are known for their reliable and easy-to-maintain operating mechanism. Their primary drawback is that this mechanism is semi-auto only, which makes it less reliable when firing weaker cartridges, such as less-than-lethal or beanbag rounds. The M4 Super 90, although externally similar to the earlier M1, M2 and M3 models, incorporates a completely new internal mechanism designed to specifications provided by the United States Marine Corps. The M4 is in use with both the US military and the British Armed Forces.
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