Sig Sauer Magazine Sig P320, P320 X-FIVE, M17, P250 Full Size 9mm Luger Steel

Keep shooting longer between reloads with a Sig Sauer Magazine built to the same factory standards as the one that came with your P320, P320 X-FIVE, M17, or P250 full-size pistol. Available in 21-round or 30-round capacities, these 9mm steel magazines deliver the reliability you expect from Sig—no compromises on function or durability, whether you're training at the range, competing, or preparing for self-defense.

These aren't typical extended magazines cobbled together by a third party. Sig manufactures them with complete steel construction and a high-lubricity finish to ensure smooth feeding and consistent performance across thousands of rounds. The 30-round variant includes a removable sleeve that slides onto the base plate, giving you better ergonomics and grip comfort when you're running the magazine in your full-size grip module—take it off if you want a slimmer profile or prefer the bare magazine.

Maintenance is straightforward: the base plate is removable for quick cleaning and spring inspection. Witness holes marked in increments of five let you see your round count at a glance, so you know when to top off before a stage or training session. The high-tensile spring is engineered for long service life and consistent feeding under real-world use—no babying required.

Whether you're building out a competition setup, stocking spares for duty carry, or just want more time on target, these Sig factory magazines give you confidence that your ammo will feed when it needs to.

Key Features

• 21-round or 30-round capacity in 9mm Luger
• Complete steel body construction for durability
• High-lubricity finish for reliable feeding
• Removable sleeve on 30-round magazine for enhanced grip comfort
• Witness holes in 5-round increments for quick round count
• Removable base plate for easy maintenance and spring access
• High-tensile spring engineered for extended service life
• Durable polymer follower
• Compatible with Sig P320, P320 X-FIVE, M17, and P250 full-size pistols

Specifications

Frequently Asked Questions

Which Sig pistols do these magazines fit?

These magazines are factory designed for the Sig P320, P320 X-FIVE, M17, and P250 full-size models in 9mm Luger. They will not function in compact or subcompact grip modules or other calibers.

What's the difference between the 21-round and 30-round versions?

Both use the same steel construction and high-lubricity finish. The 30-round magazine includes a removable sleeve that fits over the base plate for improved comfort and grip ergonomics when used in the full-size grip module. You can remove the sleeve if you prefer a slimmer magazine or want to use it in a different configuration.

Can I take these magazines apart for cleaning?

Yes. The base plate is removable, allowing you to access the spring and follower for inspection and maintenance. This makes it easy to clean out any debris or perform routine upkeep.

How do I know how many rounds are left in the magazine?

Rear witness holes marked in increments of five let you see the remaining rounds at a glance without having to unload the magazine.