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The Smith & Wesson M&P 15-22 is a .22 LR variant of the Smith & Wesson M&P 15 .. Smith & Wesson. Smith & Wesson. It is blowback-operated , rather than direct impingement-operated and is intended for recreational shooting -LRB- `` plinking '' -RRB- and small game hunting .. blowback. Blowback ( arms ). direct impingement. direct impingement. plinking. plinking. It is made with a polymer upper and lower receiver , rather than the aluminum that is normally used in AR-15s and uses proprietary polymer magazines .. receiver. Receiver ( firearms ). aluminum. aluminum. magazines. Magazine ( firearms )