M6 series

M6 may refer to...
 * M6B Magnum Sidearm
 * M6D Magnum Sidearm - The Halo: Combat Evolved pistol.
 * M6C Magnum Sidearm - The Halo 2 pistol.
 * M6G Personal Defense Weapon System - The Halo 3 pistol.
 * M6J Carbine - A UNSC Army weapon.