ProMag SIGA4 20-Round Magazine 40 S&W/357 SIG Sig Sauer P226 Steel

The ProMag SIGA4 magazine extends the Sig Sauer P226's capacity to 20 rounds in 40 S&W and 357 SIG calibers. This steel-bodied magazine addresses the need for increased ammunition capacity during extended training sessions and competitive shooting events.

What Makes This Different

The SIGA4 features a blued steel construction that provides superior durability compared to polymer alternatives. The extended body design maintains the P226's balance while adding 5 additional rounds over standard factory magazines. Heat-treated steel components resist deformation under repeated loading cycles, ensuring consistent feeding geometry throughout the magazine's service life.

Key Features

• 20-round capacity for 40 S&W and 357 SIG ammunition
• Blued steel body construction with corrosion-resistant finish
• Compatible with Sig Sauer P226 pistol platform
• Heat-treated steel spring maintains tension over extended use
• Anti-tilt follower design prevents ammunition binding
• Extended baseplate with textured grip surface
• Drop-free design enables rapid magazine changes

The SIGA4 performs reliably in competitive shooting environments where high round counts demand consistent feeding. Steel construction withstands the stress of rapid magazine changes during USPSA and IDPA competitions. The extended capacity reduces reload frequency during training drills and qualification courses. Law enforcement agencies utilize these magazines for duty applications requiring increased ammunition capacity.

Technical Specs

• Capacity: 20 rounds
• Caliber: 40 S&W, 357 SIG
• Compatibility: Sig Sauer P226
• Body Material: Blued steel
• Spring: Heat-treated steel
• Follower: Anti-tilt polymer
• Overall Length: Approximately 6.2 inches
• Weight: 4.8 ounces (empty)
• Manufacturer: ProMag Industries

The ProMag SIGA4 delivers the capacity advantage serious shooters require without compromising reliability. Steel construction ensures long-term performance under demanding conditions. This magazine represents a practical solution for extending the P226's operational capacity.