The Benelli M4 is a gas operated, smoothbore, magazine fed, semi-automatic Joint Service Combat shotgun. Its rail can accept laser illuminators, night vision, and standard scopes. It is also designed to fire a variety of shell sizes without modification or adjustment.
This rapid firing shotgun can decimate opponents at short range, but, just like the main weapons for engineers of other armies in BF2, you are limited to this range only.

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