

Product Description
The ProMag Ruger-57 magazine (RUG-A42) is a 20-round aftermarket pistol magazine chambered for 5.7x28mm and designed to fit the Ruger-57. Built with a heat-treated steel magazine body and a durable blued/black-oxide style finish, it pairs modern injection-molded polymer components with proven spring steel performance for consistent feeding and long service life. Manufactured in the USA, it is backed by ProMags lifetime guarantee against manufacturers defects.
Product Highlights
- 20-round 5.7x28mm pistol magazine designed to fit Ruger-57 handguns
- Heat-treated high-carbon steel magazine body for strength and durability
- Injection-molded polymer follower engineered for smooth, consistent feeding
- Heat-treated chrome silicon wire spring helps maintain reliable tension over time
- Made in the USA and backed by ProMags lifetime guarantee against manufacturer defects
Specs
- Brand: ProMag Industries
- Manufacturer Part Number: RUG-A42
- UPC: 708279015335
- Compatibility: Ruger-57
- Caliber: 5.7x28mm
- Capacity: 20 rounds
- Body Material: Heat-treated steel
- Follower Material: Polymer (injection molded)
- Spring Material: Heat-treated chrome silicon wire
- Finish: Blued / black oxide (see notes)
- Country of Manufacture: USA
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