ProMag Sig Sauer P365 9mm Luger 20rd Magazine Black Oxide

The ProMag Sig Sauer P365 9mm Luger 20-round magazine is a high-capacity answer for shooters who want more rounds downrange without reloading. Built for the Sig Sauer P365 platform, this magazine transforms your carry or range gun into a higher-capacity package while maintaining reliability. Whether you're training at the range, running drills, or building redundancy in your magazine rotation, a 20-rounder gives you practical flexibility that standard-capacity mags can't match.

Construction centers on heat-treated steel, finished in black oxide for corrosion resistance and durability in the field. The magazine follower is injection molded to ensure smooth, consistent round feeding, while the spring uses heat-treated chrome silicone wire—engineered to maintain tension and reliability through thousands of cycles. All of this is built in the USA, so you're supporting domestic manufacturing while getting a magazine designed with real-world performance in mind.

Magazine reliability is foundational to pistol function. ProMag's P365 mag uses proven materials and manufacturing to keep rounds fed reliably when it matters. If you shoot your P365 regularly, a 20-round option rounds out your magazine family and gives you flexibility on the range or at the range without breaking the bank.

Key Features

• 20-round capacity for the Sig Sauer P365 platform
• Heat-treated steel construction with black oxide finish resists corrosion
• Injection-molded follower ensures consistent feeding
• Heat-treated chrome silicone wire spring for reliable tension and cycle life
• Made in the USA

Specifications

Frequently Asked Questions

Is this magazine compatible with the Sig Sauer P365?

Yes, the ProMag magazine is designed specifically for the Sig Sauer P365 9mm Luger platform.

What's included when I buy this magazine?

You receive the 20-round magazine with the black oxide finish. No additional components or accessories are included.

How does 20-round capacity compare to factory magazines?

The standard Sig P365 magazine holds 12 rounds; this 20-round option provides significantly greater capacity for range training, competitive shooting, or building redundancy in your magazine supply without changing firearms.

Will the black oxide finish protect the steel from rust?

The black oxide finish provides corrosion resistance and durability during regular use. Like all steel magazines, proper care—keeping it clean and dry—extends its lifespan.