SIG SAUER P229 .40 S&W and .357 SIG 12-Round Magazine

SIG SAUER P229 12-Round Factory Magazine for .40 S&W and .357 SIG

The SIG SAUER MAG2294312 is a factory 12-round magazine made for P229 pistols chambered in .40 S&W or .357 SIG. It gives P229 owners an OEM-pattern spare or replacement magazine built around the correct body geometry, feed-lip profile, spring, follower, and baseplate configuration for the intended pistol and cartridges. This listing is for one detachable magazine.

A quality magazine is a central part of a semiautomatic pistol’s feeding system. Using the correct factory-pattern magazine helps maintain the relationship between the cartridge stack, follower, feed lips, and pistol’s magazine catch. This SIG magazine is constructed from steel and protected by a black phosphate finish for a subdued appearance and resistance to routine wear. Its durable polymer follower moves within the body under tension from a heat-treated steel wire spring, while the impact-resistant polymer baseplate closes the assembly and provides a practical surface for seating the magazine.

Correct fit for the intended P229 configuration

This magazine is specifically identified for the SIG SAUER P229 in .40 S&W and .357 SIG. Both chamberings use this 12-round magazine configuration, making it a useful choice for owners who have a compatible P229 in either caliber. It is not a 9mm magazine and should not be selected solely because another pistol carries the P229 name. Confirm the model and caliber markings on the firearm, as well as any generation-specific fit guidance in the pistol manual, before ordering.

Numbered witness holes provide a convenient way to check the approximate number of cartridges loaded into the body. The flush, duty-oriented form preserves the pistol’s standard grip profile rather than adding an extended magazine body. That makes the magazine suitable for range practice, carry rotation where permitted, training classes, or replacing a worn or damaged magazine of the same specification.

Factory-pattern construction

• Designed for compatible SIG SAUER P229 pistols
• Compatible chamberings: .40 S&W and .357 SIG
• 12-round capacity
• Steel magazine body with black phosphate finish
• Heat-treated steel wire spring
• Durable polymer follower
• Impact-resistant polymer baseplate
• Numbered witness holes
• Detachable, standard-profile configuration
• One magazine per package

Identification

The exact manufacturer part number is MAG2294312, also commonly formatted as MAG-229-43-12. The UPC is 798681257843. Those identifiers distinguish this 12-round .40 S&W/.357 SIG P229 magazine from visually similar P229 magazines made for 9mm and from magazines intended for other SIG pistol families. Checking both numbers is the most reliable way to match this listing to a replacement-magazine requirement.

Use and care

Before use, inspect the magazine body, feed lips, follower, spring tension, and baseplate for damage or unusual wear. Load only ammunition that matches the firearm’s chambering, keep the magazine free of heavy oil and debris, and follow the pistol manufacturer’s maintenance instructions. New magazines should be function-checked safely with the intended pistol before being placed into a carry or defensive rotation. If feeding, locking, or retention feels abnormal, stop using the magazine until the pistol and magazine can be inspected.

Magazine-capacity and shipping restrictions vary by jurisdiction and can change. Buyers are responsible for confirming that a 12-round magazine may be purchased, possessed, and delivered in their location. This product is a magazine only; it does not include a firearm or ammunition.