Originally Posted by Fishbed77
The M&P-22 (like the "Walther" P22) is made by Umarex. The slide is made of a zinc alloy that sometimes goes by the trade name "Zamak," which is commonly known as potmetal. This is a lower-quality material than the aluminum used by some other pistols like the Ruger SR22 or Browning 1911-22.
The S&W website list aluminum as the slide material.