Magpul P320 AMAG 17 SG9 Magazine - 17 Rounds for Sig P320 (MAG1331-SST)

The Magpul P320 AMAG 17 SG9 magazine is a full-capacity, duty-ready 17-round magazine built for Sig Sauer P320 handguns in 9mm. Whether you're running a full-size, compact, or sub-compact frame, this magazine delivers the round count and reliability that serious shooters and professionals demand. Magpul engineered this mag from the ground up for the P320 platform, combining a corrosion-resistant stainless-steel body with proven ergonomic features that make reloads faster and maintenance simpler than you'd expect.

Built tough for the range, duty, or carry, the AMAG 17 features a high-visibility, controlled-tilt follower that tracks rounds reliably and a stainless-steel spring engineered for longevity. The flared floorplate removes easily so you can strip, clean, and service the magazine in seconds—no fumbling, no lost springs. Magpul added a capacity-indicator window that starts at the 5-round mark and continues in single-round increments up the spine, so you know exactly what you've got loaded without counting. There's also a paint-pen dot matrix molded into the body, so you can mark and organize your mags at a glance.

This is the magazine for shooters who want zero guesswork: one standardized design, three frame sizes, one mission. Built, tested, and backed by Magpul's manufacturing standards.

Key Features

• 17-round capacity for 9mm Sig P320 platforms
• Corrosion-resistant stainless-steel magazine body
• High-visibility, controlled-tilt follower for reliable feeding
• Stainless-steel spring for durability and longevity
• Flared, easily removable floorplate for quick cleaning and maintenance
• Capacity-indicator window (starts at 5 rounds, increments by 1)
• Paint-pen dot matrix for magazine marking and identification
• Compatible with full-size, compact, and sub-compact P320/M17/M18 variants

Specifications

Frequently Asked Questions

Will this magazine work with my Sig P320 in all frame sizes?

Yes. The Magpul P320 AMAG 17 SG9 is compatible with full-size, compact, and sub-compact variants of the P320, M17, and M18 platforms.

What makes this magazine easier to maintain than standard Sig mags?

The flared floorplate removes easily without tools, letting you disassemble the magazine quickly for cleaning and routine maintenance. The stainless-steel body and spring resist corrosion, reducing the work needed to keep it field-ready.

How does the capacity indicator window work?

The window begins at the 5-round mark and continues along the spine of the magazine in 1-round increments, so you can see your round count at a glance without unloading or counting manually.

Can I mark this magazine to keep my mags organized?

Yes. The magazine features a paint-pen dot matrix molded into the body, designed to accept marking so you can identify and organize your magazines by load, duty, or other criteria.