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The M16A2, M16A4, M4, M4A1, Diemaco C7 and C8, etc. have a 1 turn in 7 inches rifling twist. Although 1 turn in 9 inches is actually the ideal rifling twist for the 62 grain M855/SS109 NATO round, 1 in 7 was chosen because it can fire the 64 grain M856/L110 tracer with the same performance as it would the M855/SS109. It is also advantageous in that it can fire heavier cartridges, such as the 77 grain Mk 262 cartridge, which would be too heavy for a 1 in 9 barrel to stabilise.

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Q: What is the rifling ratio of the M16A2?
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