29 November 2009

AR Stuff That Baffles Me

There is a camp of people who are dedicated to the 1:7 twist in the AR.

This was actually the second choice for the twist in the 5.56x45mm NATO development, the original being 1:9.

1:9 did not stabilize the NATO tracer round when tested in "arctic" conditions. Winter, in Alaska.

If your argument for 1:7 is that you can shoot surplus NATO ammo, will you be shooting tracers in the winter in Alaska? If not, 1:9 is actually optimal for NATO ball ammo.

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