KCI USA AR 15 Polymer Magazine Review: Best Cheap Practice Mags?

KCI USA recently came out with their own polymer bodied, 30 round ar15 magazines. I do some shooting with them, drop them on concrete, run them over, and drag them behind a truck going over gravel. Cheap, reliable and good looking, these mags are perfect for range or training use.
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Music: Cutting It Close
Artist: DJ Freedom
Link: https://www.youtube.com/watch?v=5iYXp...