Sir, with all due respect, that's just something I have always tried not to do. I can only relate to personal experience, but M16s did occasionally work after being submerged in Vietnam. I never fired one underwater but sure have fired one with water and mud in the barrel and everywhere else in it. I've also dunked one in a creek to wash the mud off after crawling in a rice paddy,shook out the water and it worked. The 4th Inf in the Delta dealt with that much more than where I was.
RK
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