This video provides a comparison of four different U.S. military .50 caliber machine gun barrels used over the past 90 years. It showcases and briefly discusses the M3 aircraft barrel, M2 heavy barrel, M2 water-cooled barrel, and the M85 coaxial barrel, all chambered in the .50 BMG caliber. The video is aimed at a military and firearms enthusiast audience, highlighting historical and technical aspects of these significant weapons.
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