This is a ProMag® STEEL 15-round magazine for FNX-45 Pistols in .45 ACP.
These double-stack magazines are crafted from heat-treated blued steel with chrome silicon internal springs and the same recognizable rounded baseplate of the FNX-45’s factory magazines. Delivering the ultimate in tactical, big-bore firepower, the FNX-45 is a .45 caliber polymer combat pistol for a whole new generation. Featuring a stainless steel slide, double-action trigger, and ultra-robust construction, it’s the perfect choice for a wide variety of combat, home defense, and even hunting applications. ProMag magazines come with their proprietary anti-fatigue springs—designed to be stored for long periods without sacrificing reliability—and their lifetime replacement guarantee.