well, like the manual says, load 1 at a time, pull the buttons on the side, just enough down to load 1 in at a time, and while you do this make sure to that the backend of the bullet is all the way back touching the mag, and make sure to tap the mag on your palm or leg, bench whatever, to better seat the bullets, im still no expert on it. But that should help you.

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Smth & Wesson M&P AR15-22