It was Ball powder that proved unreliable
Ball powder was made from reclaimed stock and had to be treated with calcium carbonate to increase the pH as decomposing nitrocelluose is quite acidic. IMR was made from virgin stock and needed no acid inhibitor like calcium carbonate.
The M16 can be a picky weapon if you drag it through mud and sand but its also an accurate and durable weapon when properly treated. I fired nearly 1000 rounds in basic training and did not have a single failure. There were Joe's who got their rifles dirty, esp. on Paragon trail, and had malfunctions but that was with BLANKS.
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