One of the things I love most about the AR platform is how versatile it is. There is almost an unlimited amount of different calibers you can build an AR in and its very popular for many AR owners to have multiple different caliber uppers for a single lower. As you can imagine, this also opens up the possibility of chambering the wrong ammunition into the wrong upper which can be extremely dangerous to the shooter and those near by.
In the past I’ve resorted to writing on the side of my magazines with a paint pen and have even …read more
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