Rock Island 3209 ACT-MAG 17rd 9mm Magazine Sig P320/M17 Blued

The Rock Island 3209 ACT-MAG delivers reliable 17-round capacity for Sig Sauer P320 and M17 pistols at a fraction of OEM magazine costs. This aftermarket magazine provides shooters with extended capacity and proven feeding performance for training, competition, and duty applications.

What Makes This Different

Unlike standard 15-round factory magazines, the ACT-MAG extends capacity to 17 rounds without compromising reliability or adding excessive length. The blued steel construction resists corrosion better than polymer alternatives while maintaining the precise tolerances required for consistent feeding. Rock Island's manufacturing process ensures drop-free performance and positive lockup in both civilian P320 variants and military M17 pistols.

Key Features

• 17-round capacity increases firepower by 13% over standard magazines
• Blued steel construction provides superior durability and corrosion resistance
• Direct compatibility with Sig P320 Full Size, Compact, and M17 pistols
• Heat-treated steel body withstands repeated loading cycles
• Anti-tilt follower design prevents feeding malfunctions
• Witness holes allow visual ammunition count verification
• Drop-free design enables rapid magazine changes under stress

Range testing demonstrates consistent feeding across various 9mm ammunition weights from 115 to 147 grains. The magazine functions reliably in competitive shooting environments where rapid reloads are critical. Law enforcement agencies have adopted similar capacity magazines for duty use, citing the balance between increased ammunition capacity and weapon handling characteristics. The steel construction maintains spring tension longer than polymer magazines during extended storage periods.

Technical Specs

• Capacity: 17 rounds of 9mm Luger ammunition
• Compatibility: Sig Sauer P320 Full Size, Compact, M17
• Construction: Blued carbon steel body
• Follower: Anti-tilt polymer design
• Spring: Heat-treated steel coil spring
• Base plate: Removable polymer with lanyard loop
• Country of Origin: Philippines
• UPC: 812285025476

The ACT-MAG represents proven aftermarket engineering at competitive pricing for serious shooters. Rock Island's quality control standards ensure consistent performance across production runs, making this magazine a practical choice for building magazine inventory without premium costs.