Smooth feeding is mandatory! SGM Tactical is in the business of manufacturing durable Magazines that feed flawlessly, fit perfectly in your firearm, and last for years. Each Magazine goes through a rigorous testing process with a variety of ammo brands to ensure you're getting the best product possible. This 31-round Magazine is made from Dupont composite/glass-filled polymer and features a stainless steel spring. Magazine fits all Glock 22, 23, 27 and 35 pistols chambered in .40 S&W.