

Product Description
The ProMag SIG-A21 magazine is designed for Sig Sauer P365-series 9mm pistols and offers a 20-round capacity for extended range time and fewer reloads. Built with a heat-treated steel magazine body and a black oxide (blue steel) finish, it is engineered for durability and consistent performance. Inside, an injection-molded follower and a precision-wound spring made from heat-treated chrome silicon wire help promote reliable feeding. Made in the USA and backed by ProMags lifetime guarantee against manufacturers defects.
Product Highlights
- 20-round capacity 9mm magazine compatible with Sig Sauer P365 / P365X / P365XL pistols
- Heat-treated steel magazine body with black oxide (blue steel) finish for corrosion resistance
- Injection-molded magazine follower for smooth, consistent operation
- Heat-treated chrome silicon wire spring for long-lasting tension and reliability
- Made in the USA and backed by a ProMag lifetime guarantee against manufacturer defects
Specs
- Brand Name: ProMag Industries
- Manufacturer Part Number: SIG-A21
- UPC: 708279015908
- Firearm Fit: Sig Sauer P365 / P365X / P365XL
- Caliber: 9mm
- Capacity: 20 rounds
- Body Material: Heat-treated steel
- Finish: Black oxide (blue steel)
- Follower: Injection molded
- Spring Material: Heat-treated chrome silicon wire
- Country of Manufacture: USA
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