The ProMag Industries Magazine, .45 ACP, 13 Rounds, Fits Smith & Wesson M&P 45, Steel, Blued Finish – Model SMI-A16 / SMIA16, UPC 708279012587 is an aftermarket double-stack pistol magazine engineered as a replacement or spare for full-size Smith & Wesson M&P 45 pistols. Built from heat-treated steel with a blued (black oxide) finish and equipped with a chrome-silicon spring, polymer follower, and impact-resistant baseplate, this 13-round magazine is designed to support reliable feeding for training, range, and defensive applications where standard-capacity .45 ACP magazines are appropriate and legal.
Platform Compatibility and Caliber
This ProMag SMI-A16/SMIA16 magazine is designed specifically for Smith & Wesson’s .45 ACP M&P series:
Firearm compatibility: Smith & Wesson M&P 45 (full-size .45 ACP models that use 13-round double-stack magazines)
Caliber: .45 ACP (Automatic Colt Pistol)
Capacity: 13 rounds (13+1 when one round is chambered)
Configuration: Double-stack detachable box magazine
It is intended as a replacement or spare magazine that matches the form factor and capacity of typical factory-standard M&P 45 magazines.
Magazine Body, Material, and Finish
The magazine body is built for strength, dimensional stability, and corrosion resistance:
Body material: Heat-treated steel for rigidity and resistance to dents and deformation
Tube construction: Stamped and welded steel magazine tube, engineered for consistent internal dimensions and reliable cartridge stacking
Exterior finish: Blued / black oxide finish to help protect against corrosion and wear while providing a low-glare, matte surface that blends with common M&P finishes
The steel tube and protective finish make this magazine suitable for regular range use and typical carry environments, including exposure to holsters, pouches, sweat, and humidity.
Internal Components: Follower and Spring
To support reliable feeding and long-term durability, ProMag uses robust internal components:
Follower:
Injection-molded polymer follower, shaped to guide .45 ACP cartridges smoothly toward the feed ramp
Designed to reliably actuate the slide stop after the last round
Spring:
Heat-treated chrome-silicon wire spring, often described as an “anti-fatigue” or long-life spring
Engineered to maintain consistent tension after repeated loading cycles and during extended periods of loaded storage
The combination of a steel tube, low-friction polymer follower, and high-quality chrome-silicon spring is intended to provide consistent feeding across the full 13-round stack when the magazine is clean and used with ammunition appropriate for the M&P 45 platform.
Baseplate, Form Factor, and Handling
The SMI-A16/SMIA16 is equipped with a durable, removable base assembly:
Baseplate material: Impact-resistant polymer floorplate / basepad
Removable floorplate: Allows the magazine to be disassembled for internal cleaning, inspection, and spring or follower replacement if needed
Form factor:
Double-stack .45 ACP geometry designed to fit the M&P 45 grip frame and magwell
Overall length and contour comparable to factory 13-round M&P 45 magazines, making it suitable for duty use, range work, and everyday carry setups where legal
The basepad is shaped to support positive seating and easy stripping of the magazine, while maintaining smooth edges to reduce printing and snagging under a cover garment.
Reliability, Origin, and Warranty
ProMag positions this magazine as a durable, cost-effective alternative to OEM magazines:
Design approach: Utilizes heat-treated steel bodies, chrome-silicon springs, and injection-molded polymer followers and baseplates built to handle high round counts and demanding use
Origin: Made in the USA, consistent with ProMag’s common manufacturing practices
Warranty: Backed by ProMag’s lifetime replacement warranty against defects in materials and workmanship (per ProMag policy)
As with all aftermarket magazines, users should function-test this magazine in their specific M&P 45 with their chosen ammunition to confirm reliability and slide lock-back before relying on it for defensive purposes.
Typical Use Cases
The ProMag 13-Round .45 ACP Magazine for S&W M&P 45 (SMI-A16 / SMIA16) is suitable for several roles:
Range and practice: Extra magazines help reduce downtime between strings of fire and enable realistic reload drills.
Home-defense configurations: Provides additional ready-to-use magazines for an M&P 45 kept for defensive use, where permitted by local laws.
Everyday carry / duty (where legal): A 13-round standard-capacity magazine can be used as a primary or spare magazine, subject to jurisdictional capacity limits and agency policy.
Backup or replacement: Offers a budget-conscious alternative for shooters who want more magazines than those supplied with the firearm from the factory.
Users must always comply with local and state regulations regarding magazine capacity and transport.
Maintenance and Care
Proper maintenance helps ensure reliable operation and extends service life:
Cleaning:
Periodically remove the polymer baseplate and disassemble the magazine.
Clean interior surfaces, follower, and spring of powder residue, dirt, and debris using appropriate cleaning supplies.
Inspection:
Check feed lips for cracks, warping, or sharp burrs.
Inspect the spring for rust or noticeable loss of tension.
Ensure the follower moves freely from empty to fully loaded positions without binding.
Regular cleaning and inspection are especially important if the magazine is used frequently at the range or carried daily.
Technical Identification and Catalog Data
For ecommerce listings, inventory systems, and SEO-optimized product pages, the magazine can be identified with the following standardized details:
Product name: ProMag Industries Magazine, 45 ACP, 13 Rounds, Fits Smith & Wesson M&P 45, Steel, Blued Finish
Manufacturer: ProMag Industries
Model / Part Number: SMI-A16 / SMIA16
UPC / Barcode: 708279012587
Firearm compatibility: Smith & Wesson M&P 45 pistols (full-size, double-stack .45 ACP models)
Caliber: .45 ACP
Capacity: 13 rounds
Body material: Heat-treated steel
Finish: Blued / black oxide
Follower: Injection-molded polymer
Spring: Heat-treated chrome-silicon wire
Baseplate: Polymer, removable
Configuration: Double-stack semi-auto pistol magazine
Including these data points in product titles, bullet points, and metadata helps capture searches such as “ProMag SMI-A16 M&P 45 13rd magazine,” “SMIA16 45 ACP blued steel mag for Smith & Wesson M&P45,” or direct UPC lookups 708279012587.
In summary, the ProMag Industries Magazine, 45 ACP, 13 Rounds, Fits Smith & Wesson M&P 45, Steel, Blued Finish (SMI-A16 / SMIA16, UPC 708279012587) is a U.S.-made, standard-capacity double-stack magazine featuring a heat-treated blued steel body, chrome-silicon spring, polymer follower, and removable polymer baseplate. It serves as a practical replacement or spare magazine solution for owners of Smith & Wesson M&P 45 pistols who need additional reliable magazines for range work, training, or defensive roles where 13-round .45 ACP magazines are permitted.
The End
