As a reservist in the Army, I know that I was never taught to specifically use the bolt catch to aid reloads. I had to figure it out myself from playing Modern warfare and watching speed reloading vids on youtube. I show this "trick" to many soldiers and they too are surprised how much easier it is than using the charging handle. I cringe every time I see someone on the range fumble with the charging handle during a reload.
It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle
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