Strong, lightweight polymer
Springs are precision wound
Heat-treated chrome silicon wire
This AR-15/M16 .223 Remington Polymer 42-Round Magazine from ProMag is injection molded from strong, lightweight polymer. The springs are precision wound using heat-treated chrome silicon wire. All of these combine for a consistent, durable magazine.
Note: Shipping restrictions are active in CA, CO, CT, HA, IL, MA, MD, NJ, and NY for magazines with 16 or more rounds.