Image: Hammer forged 6-right polygonal rifling pattern
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Description: Hammer forged 6-right polygonal rifling pattern.
Title: Hammer forged 6-right polygonal rifling pattern
Credit: http://www.ojp.usdoj.gov/nij/training/firearms-training/module10/fir_m10_t09_01.htm
Author: United States Department of Justice
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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