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Magpul’s AMAG series of magazines are built specifically for firearms compatible only with metal magazines.
The AMAG 21 SG9 is a 21-round magazine designed for the SIG P320 9mm handgun. It features a stainless-steel body with polymer sub-components and comes packed with Magpul’s trusted features:
- High-visibility, controlled-tilt follower for reliable feeding
- Stainless-steel spring for durability and long service life
- Flared, easily removable floorplate for simplified cleaning and maintenance
- Paint-pen dot matrix for easy identification and marking
- Capacity indicator windows starting at five (5) rounds, continuing in one (1)-round increments along the magazine spine
Proudly Made in the USA.
Key Features
- Corrosion-resistant, stainless-steel magazine body
- High-visibility, controlled-tilt follower
- Stainless-steel spring for longevity and durability
- Capacity indicators in one-round intervals starting at five rounds
- Flared floorplate for easy maintenance
- Paint-pen dot matrix panel for quick identification

Product Specs | |
Ammo Capacity | 21 Rounds |
Caliber | 9x19mm |
Color | Stainless |
Upgrade For | Sig Sauer |
Magpul
Magpul was founded in 1999 with the intent of developing a simple device to aid in the manipulation of rifle magazines while reloading under stress. The company’s name comes from this original product called the Magpul®. Over the last twenty years Magpul has continued to grow and develop using much the same mission and process with a focus on innovation, simplicity, and efficiency.
