Sig Sauer MAG365912 P365 12-Round Extended Magazine 9mm Luger

The Sig Sauer MAG365912 extends the P365 platform's capacity to 12 rounds while maintaining the pistol's compact profile. This extended magazine transforms the standard 10-round capacity into a higher-capacity option without significantly altering the firearm's concealability or grip dynamics.

What Makes This Different

Unlike aftermarket alternatives, this factory Sig Sauer magazine maintains the same reliability standards as the original equipment. The extended baseplate adds approximately 0.75 inches to overall length while providing a full grip surface for all fingers. Heat-treated blued steel construction ensures consistent feeding and extraction cycles through thousands of rounds.

Key Features

• 12-round capacity increases firepower by 20% over standard magazines
• Blued steel construction with anti-tilt follower for reliable feeding
• Compatible with P365, P365XL, and P365 Micro Compact pistols
• Extended baseplate provides improved grip purchase and control
• Factory specifications ensure proper fit and function
• Witness holes allow quick visual ammunition count verification
• Drop-free design enables rapid reloads under stress

Field testing demonstrates consistent performance across various ammunition weights from 115 to 147 grains. The magazine functions reliably in temperatures from -20°F to 140°F, making it suitable for duty carry, competitive shooting, and personal protection scenarios. The extended grip surface reduces muzzle flip and improves follow-up shot accuracy compared to flush-fit alternatives.

Technical Specs

• Capacity: 12 rounds of 9mm Luger ammunition
• Construction: Heat-treated blued steel body
• Compatibility: Sig P365, P365XL, P365 Micro Compact
• Overall length: Approximately 4.6 inches
• Weight: 3.2 ounces empty
• Follower: Anti-tilt polymer design
• Spring: Stainless steel with controlled compression
• Country of origin: United States

This factory magazine delivers the reliability Sig Sauer owners expect while maximizing the P365 platform's defensive capabilities. Professional users and civilian carriers alike benefit from the increased ammunition capacity without sacrificing the pistol's inherent concealability advantages.