A factory original Glock 42 6 round magazine with additional finger extension. The extra room for your shooting hand makes that wonderful difference especially for a smaller pistol like a G42. Glock Factory magazines are the most reliable and rugged choice when it comes to your Glock as the countless Glock users around the world know. Factory Glock magazines will feed fire function and cycle perfectly drop-free when ejected and should hold your slide open after your mag runs dry. The core of these durable magazines are formed in steel with an advanced polymer (called polymer 2) that encases the metal. This two-layer magazine composition is staggeringly reliable and proven.