The ProMag SMI29 delivers reliable feeding and extended capacity for Smith & Wesson M&P Shield pistols chambered in 40 S&W. This aftermarket magazine provides shooters with additional rounds compared to factory options while maintaining the compact profile essential for concealed carry applications.
What Makes This Different
Unlike factory magazines that prioritize minimal printing, the SMI29 balances capacity with concealability through its steel construction and optimized spring tension. The blued steel body resists corrosion better than polymer alternatives while the heat-treated spring maintains consistent feeding pressure across thousands of cycles. ProMag engineers this magazine to function reliably with both jacketed and lead bullets commonly used in 40 S&W loads.Key Features
- 6-round capacity extends firepower beyond standard 5-round factory magazines
- Blued carbon steel construction provides durability and corrosion resistance
- Heat-treated chrome silicon spring maintains tension through extended use
- Polymer follower reduces friction and ensures smooth cartridge presentation
- Compatible with all Smith & Wesson M&P Shield models in 40 S&W
- Drop-free design enables fast reloads during tactical situations
- Witness holes allow quick round count verification
Technical Specs
- Capacity: 6 rounds
- Caliber: 40 Smith & Wesson
- Construction: Blued carbon steel body
- Spring: Chrome silicon wire, heat-treated
- Follower: High-impact polymer
- Compatibility: S&W M&P Shield 40 S&W models
- Overall length: Approximately 4.2 inches
- Weight: 3.1 ounces (empty)
- Finish: Traditional blued steel
- Country of origin: USA
