+3 Magazine Extension for Sig Sauer P320 9mm / .40 S&W

Increase the capacity and performance of your Sig Sauer P320 with the IMI Defense™ +3 Magazine Extension. Precision engineered for Sig Sauer P320 metal magazines, this reinforced polymer extension adds three additional rounds while maintaining excellent reliability, ergonomics, and control.

Compatible with both 9mm and .40 S&W magazines, the extension integrates seamlessly with compact, standard, and extended magazine configurations. The lightweight yet highly durable space-grade polymer construction is built to withstand harsh duty, range, and defensive environments while resisting impact, chemicals, heat, cold, and UV exposure.

Designed with aggressive side and front tactile texturing, the extension improves grip and control during reloads and magazine manipulation. Installation is quick and simple using the included insert plate, with no spring replacement required.

Compatible with multiple Sig Sauer grip modules including AXG, X5 LEGION, XFULL, XCARRY, XCOMPACT, and Nitrone configurations, the IMI Defense™ +3 Magazine Extension delivers enhanced capacity and dependable performance without unnecessary bulk.

Features & Benefits

• Adds +3 rounds to Sig Sauer P320 magazines
• Compatible with 9mm and .40 S&W magazines
• Fits compact, standard, and extended magazine configurations
• Lightweight reinforced space-grade polymer construction
• Extreme impact resistance
• Resistant to harsh chemicals, heat, cold, and UV exposure
• Enhanced tactile texturing for improved grip and reload control
• Easy installation with included insert plate
• No spring replacement required
• Compatible with Sig Sauer metal magazines

Compatible Grip Modules

• AXG
• X5 LEGION
• XFULL
• XCARRY
• XCOMPACT
• Nitrone grip modules