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Theres been talk of the 6.8 SPC replacing 5.56 NATO, but I don't really see the point when a militarized .243 Win would perform better an be cheaper to manufacture.
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One reason is that the .243 would require a completely different platform due to it's OAL. The 6.8 will fit in the standard size mag well of the M16/M4 so all that would be needed would be barrel, bolt and mag change where the .243 is the same length as the 7.62 Nato and would require the AR10 sized rifle which is heavier, would require a complete replacement of everything they already have in service and defeats the whole purpose of the smaller lighter platform.