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Old December 17, 2012, 11:56 AM   #5
Senior Member
Join Date: March 1, 2000
Location: Western WA
Posts: 7,155
The original M16 and M16A1 rifles were - if memory serves - !:12. That resulted in a 55 grain bullet going around 3200 feet per second with military rifle and ammon.
The earliest ARs, pre-M16, were 1:14. They didn't even stabilize 55s all that well, but it contributed to the "explosive" wounding reported by Army advisors in Vietnam in the early '60s.
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