Item #:
708279013331
UPC: #:
708279013331
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ProMag SIGA8 17-Round 9mm Magazine for Sig Sauer P320 Blued Steel

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The ProMag SIGA8 delivers reliable 17-round capacity for Sig Sauer P320 pistols, extending standard magazine capacity by 2 rounds. This blued steel magazine provides shooters with increased firepower while maintaining the proven reliability expected from aftermarket magazines.

What Makes This Different

Unlike polymer alternatives, the SIGA8 features heat-treated blued steel construction that resists deformation under stress. The magazine body maintains consistent dimensions even after thousands of loading cycles, ensuring reliable feeding and ejection. Steel construction provides superior durability compared to standard polymer magazines, particularly in high-volume shooting applications.

Key Features

  • 17-round capacity increases standard P320 magazine capacity by 2 rounds
  • Heat-treated blued steel body resists wear and deformation
  • Compatible with all Sig Sauer P320 variants including Compact, Carry, and Full Size
  • Anti-tilt follower design ensures consistent cartridge presentation
  • Heat-treated chrome silicon spring maintains tension over extended use
  • Removable floorplate allows for easy cleaning and maintenance
  • Witness holes provide visual round count verification
Range testing demonstrates consistent feeding with various 9mm ammunition weights from 115 to 147 grains. The magazine functions reliably in competition environments where rapid reloads are critical. Steel construction maintains dimensional stability in temperature extremes from -20°F to 140°F, making it suitable for duty carry and outdoor applications.

Technical Specs

  • Capacity: 17 rounds of 9mm Luger
  • Construction: Heat-treated blued steel body
  • Compatibility: Sig Sauer P320 all variants
  • Spring: Chrome silicon wire
  • Follower: Anti-tilt polymer design
  • Overall Length: Approximately 5.2 inches
  • Weight: 4.2 oz empty
  • Country of Origin: USA
The SIGA8 represents a cost-effective capacity upgrade for P320 owners who demand reliability without premium pricing. ProMag's established manufacturing standards ensure consistent quality across production runs, backed by the company's reputation in the aftermarket magazine sector.