Quote:
Originally Posted by BAC
Grant, is this true of RRA uppers as well? My understanding is that they were true 5.56, even though they're 1:9.
-B
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Generally speaking, yes. Manufacturers that produce 1/9 twist AR's are betting that the consumer that buys their weapons will NEVER use high end (read expensive) Mil-Spec Ball ammo in their guns so they will never find out that there is an issue.
The M193 ammo will generally work just fine in a .223 Wylde chamber, but when you get into M855 and MK262 is where you can find the issues.
C4