The Dark Reason M16 Killed U.S. Marines in Vietnam 💀💥🔫☠️

This video walks through the full story behind the M16’s troubled debut in Vietnam and how a rifle that looked perfect on paper ended up failing so badly in its first real war. It starts with the post–World War II push to replace a whole mix of weapons and calibers with a single family of small arms, the move from .30-06 to 7.62 NATO and the M14, and why that long, heavy battle rifle never really matched the way most firefights actually happened. From there it follows Eugene Stoner at Armalite, the development of the AR-10 and AR-15, and the shift to 5.56×45 high-velocity ammunition. You will see how the new design promised low recoil, light weight, higher hit probability, and three times the carried ammunition compared with 7.62, and how those early field trials in Vietnam seemed to prove that the “small-caliber, high-velocity” idea worked.

Then the video explains what went wrong when the AR-15 became the standard-issue M16 and was rushed into combat. It covers how the rifle was sold inside the system as a “self-cleaning” weapon, how early units were sent to a hot, wet jungle with no proper cleaning kits or chrome-lined chambers, and how a quiet change from the original IMR extruded powder to WC846 ball powder completely changed the way the rifle behaved. That ammunition switch raised pressures and cyclic rate, drove fouling into the gas system and chamber, and contributed to failures to extract that could only be cleared with cleaning rods many units did not have. The piece also looks at early magazine issues, the controversial forward assist, and how letters from the field, press reports, and congressional hearings eventually forced the Army to confront the problem.

Finally, the video lays out how the M16A1 was fixed and what that meant for later troops. Chrome-lined chambers and bores, revised buffers and gas ports, improved flash hiders, reformulated 5.56 loads, and better 20-, 25- and 30-round magazines turned the rifle into the reliable weapon it had been meant to be, even if that came too late for the first units that had used it. The story closes with how the design evolved into the M4 carbine and became one of the longest-serving rifle families in U.S. history, while leaving open the question of how much of the original disaster was simple bureaucracy and how much was deeper negligence in a system that never held anyone truly accountable.

Chapters:
00:00 – When rifles failed and men died
00:41 – Why the M16 was born
02:15 – Stoner, AR-15, and the small-caliber leap
06:27 – Vietnam: from promise to disaster
09:43 – Dirty powder, bad mags, and no cleaning kits
15:37 – Fixing the M16 and what it cost

Original Video by Unbelievable true stories: https://www.youtube.com/watch?v=XrcfuFBay1M

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