Depending on where you reside, the M&P15-22 will come standard with either a 25-round magazine or a 10-round magazine.
Smith & Wesson M&P15-22 Magazines
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Frequently asked questions about Smith & Wesson M&P15-22 magazines
What is the capacity of the standard M&P15-22 magazine?
Are the magazines the same for the M&P15-22 and M&P15?
No, the magazines are not the same for the M&P15-22 and M&P15. The M&P15-22 is chambered in .22 LR, while the M&P15 is chambered in 5.56/.223.