The ProMag Industries DRM-A18 40-Round Magazine offers unbeatable performance and durability for firearm enthusiasts. Crafted in the USA, this magazine is engineered for precision and reliability, ensuring optimal functionality during use. With a lifetime guarantee against manufacturer's defects, you can trust in its quality. This magazine features precision-wound springs made from heat-treated chrome silicon wire, guaranteeing longevity and consistent performance throughout its lifespan. 40 - Round Capacity Precise Manufacturing Long Term Reliability Durable Polymer Construction Elevate your shooting experience with the ProMag DRM-A18, designed to deliver unparalleled reliability and capacity.