Enhance your shooting experience with the ProMag RM-40-SL 40-Round Magazine. Engineered for performance and reliability, this magazine is a cornerstone for enthusiasts. Manufactured in the USA, each ProMag magazine comes with a lifetime guarantee against defects, ensuring unmatched quality and longevity. You'll appreciate the meticulous standards applied during assembly, from precision wound springs to rigorous quality checks. 40 - Round Capacity Precise Manufacturing Long Term Reliability Durable Polymer Construction Choose ProMag RM-40-SL for dependable 40-round performance in every situation.