This M2 Machine Gun is a custom injection molded ABS plastic piece by BrickTactical. The M2 comes with x15 parts including the following!

x1 M2 Receiver
x1 Standard Heavy Barrel
x1 Water cooled Barrel
x1 Aircraft Barrel
x1 Helicopter Barrel 
x1 Charging Handle
x1 Ammo Can
x1 Butterfly Grip
x1 Gun Shield
x1 Aircraft Sight
x1 Tripod Pivot
x1 Tripod Center Body
x3 Tripod Legs

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