M4

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M4 may refer to:

Benelli M4 Super 90

Colt M4

Colt M4A1

SITES Spectre M4

M4 bayonet

• A weapon:
  • The Benelli M4 Super 90, a 12 gauge shotgun.
  • The Colt M4, a 5.56x45mm NATO combat rifle.
  • The Colt M4A1, a 5.56x45mm NATO combat rifle.
  • The SITES Spectre M4, a 9x19mm Parabellum submachine gun.
• A weapon accessory:
  • The M4 bayonet.