55gr 5.56x45mm from a 20" 1:12 pencil barrel works.
It worked well enough that the Russians Soviets copied the idea based on data they'd accumulated in Vietnam.
While improving the materials for the furniture on the A2 was something that needed to happen, and flat-tops give a flexibility unheard of in 'Nam...
I'm still not convinced we needed to change to 1:7 and should not have acquiesced to the Belgians in 1980.
I know I've read treatise after treatise about how to improve on M855, and how that leads to using heavier rounds; I don't think I've seen a comparison between M193 from a 1:12 barrel compared to a 77gr SMK from a 1:7.
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