Pro Mag Industries MPX Features The Pro Mag Industries magazine is engineered around a proprietary DuPont Zytel polymer body that stands up to drops abrasion and the daily wear of range use which means shooters get a magazine that holds its shape and function over years of service. The chrome silicon wire spring is heat treated for consistent tension across the entire 40-round column so feeding stays reliable from a full magazine down to the last round. An injection molded follower is precision fit to the body to reduce friction and tilt helping avoid the feed lips wearing unevenly over time. Made in the USA this magazine is manufactured to tight tolerances that keep it compatible with the Sig Sauer MPX platform without modification. Black in color the magazine s Zytel construction is corrosion proof and unaffected by moisture oils or solvents commonly encountered during cleaning and storage. Its 40-round capacity gives MPX shooters extended range time between reloads useful for training drills competition stages or simply reducing reload frequency at the range. The polymer housing is noticeably lighter than steel-bodied alternatives cutting down on overall carried weight for shooters running multiple spares. Backed by Pro Mag s manufacturing standards this magazine offers MPX owners an affordable way to build out a deep reserve of reliable spare magazines. Pro Mag Industries MPX Specifications Manufacturer: Pro Mag Industries Compatible Hosts: Sig Sauer MPX Caliber: 9mm Capacity: 40 Rounds Color: Black Material: DuPont Zytel Polymer Available At: GrabAGun