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Hey, i noticed this in the feild guide section of the ODST page, im thinking it's somhow linked to the online statistics part of the game, gaining up a rank unlock's you a new variant, or accessory.
Here are the mentioned variants.
Variants:
M6A: standard issue/black polymer finish
M6B: 'Officer's model'-issued with smart-linked scope [KFA-2]/hard chrome finish
M6C: 'up-sized', standard issue/black polymer finish
M6C/SOCOM: accurized-issued with smart-linked scope [VnSLS/V 6E]/black polymer finish
M6D: 'up-sized', 'Officer's model'-issued with smart-linked scope [KFA-2]/hard chrome finish
M6E: standard issue/electroless nickel finish
M6F: 'Officer's model'-issued with smart-linked scope [KFA-2]/electroless nickel finish
M6G: 'up-sized', standard issue/electroless nickel finish
M6H: 'up-sized', 'Officer's model'-issued with smart-linked scope [KFA-2]/electroless nickel finish
M6I: select-fire variant; detachable shoulder-stock/black polymer finish
M6J/C: carbine variant; 355mm barrel, detachable shoulder-stock/electroless nickel finish
M6K: police 'undercover' variant; 6 rnd magazine capacity/black polymer finish