The ProMag S&W CSX magazine is built from 4140 heat-treated steel for exceptional durability and wear resistance. Its blued oxide finish enhances corrosion protection while maintaining a sleek, professional look. Designed with precision-formed feed lips and an anti tilt polymer follower, this magazine ensures smooth and consistent feeding to minimize malfunctions. A heat-treated chrome silicon wire spring maintains optimal tension for reliable cycling. The extended design provides increased capacity while preserving a comfortable, ergonomic grip for improved handling and control.

20-round extended magazine for increased capacity
Designed to fit Smith & Wesson CSX 9mm pistol
The magazine body is constructed from heat-treated steel with a durable black-oxide finish
Precision-molded for smooth, reliable feeding, reducing friction and ensuring consistent round stacking
The magazine spring is formed from heat-treated chrome silicone wire
Proudly made in the USA for superior quality and craftsmanship

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

It is the customer’s responsibility for understanding state laws regarding magazine capacities. Palmetto State Armory abides by all state regulations regarding the sale of high capacity magazines. We DO NOT ship high-capacity magazines with firearms to certain states. We WILL NOT replace high capacity magazines with state compliant magazines. We DO NOT offer refunds in place of the magazines. Please see our terms and conditions for a list or restricted states.

California 10+ Round Magazine Buyers: PSA values your freedom and constitutional rights above all else. However, PSA will not accept new orders nor will ship any order until the Ninth Circuit Federal Court of Appeals mandate becomes finalized. Once this mandate is finalized, we will start accepting new orders and ship 10+ round magazines to California Customers.