The ProMag Industries SPR-A4 20-Round Steel Magazine offers unmatched reliability and performance for firearm enthusiasts. Constructed with durable steel and featuring a heat-treated spring, this magazine ensures longevity and consistent operation. Engineered and assembled in the USA, each magazine undergoes rigorous quality checks to meet strict standards. The precision wound chrome silicon wire spring enhances functionality and eases the loading process, making it a top choice for competitive shooters. 20 - Round Capacity Steel Construction Heat-Treated Chrome Silicon Wire Spring Manufactured & Assembled in the U.S.A. Easy Loading Rugged Construction Upgrade your shooting experience with the reliability of ProMag's SPR-A4 magazine.