The ProMag Standard 15rd .40 S&W Magazine for S&W SD-Series Pistols – Blued Steel, Model SMIA18, UPC 708279013379 (fits SD, not SD VE variants) is an aftermarket, double-stack detachable box magazine engineered for select Smith & Wesson SD-series pistols chambered in .40 S&W. Featuring a heat-treated steel body with a blued (black oxide) finish, a heat-treated chrome-silicon spring, and an injection-molded polymer follower and baseplate, this 15-round magazine is designed as a replacement or spare option for training, range, and defensive setups where standard-capacity .40 S&W magazines are appropriate and legal.
Important fit note: This magazine is designed for S&W SD .40 pistols and is not compatible with SD VE (Value Enhanced) variants, which use a different magazine design. Always confirm compatibility with your firearm model before use.
Platform Compatibility and Caliber
This ProMag SMIA18 magazine is configured for specific Smith & Wesson SD-series .40 S&W pistols:
Firearm compatibility:
Smith & Wesson SD-series pistols chambered in .40 S&W
Does not fit: SD VE (SD40 VE, SD9 VE) or M&P-series pistols
Caliber: .40 S&W (Smith & Wesson)
Capacity: 15 rounds (15+1 when one round is chambered)
Configuration: Double-stack detachable box magazine
The SMIA18 is intended as a replacement or spare magazine with a standard-capacity 15-round configuration suitable for full-size SD .40 pistols, where permitted by local regulations.
Magazine Body, Material, and Finish
The core of the SMIA18 is its robust steel magazine tube:
Body material: Heat-treated steel for improved strength and resistance to dents, deformation, and general hard use
Tube construction: Stamped and welded steel, designed to maintain consistent internal geometry for reliable cartridge stacking and feeding
Finish: Blued / black oxide finish, providing:
Corrosion resistance against moisture, sweat, and environmental exposure
A matte, low-glare surface compatible with typical black or dark-finish SD pistols
This durable steel body is built to withstand repeated insertion/removal, holster contact, and general range and carry conditions.
Internal Components: Follower and Spring
To support long-term reliability, ProMag uses proven internal components in the SMIA18:
Follower:
Injection-molded polymer follower
Designed for smooth travel within the steel tube and for proper alignment of .40 S&W cartridges
Shaped to reliably actuate the slide stop on the last round
Spring:
Heat-treated chrome-silicon wire spring
Often described as an “anti-fatigue” spring, engineered to maintain tension over many load/unload cycles and long periods of loaded storage
Combined, this follower and spring system is designed to deliver consistent feeding performance when the magazine is kept clean and used with ammunition compatible with the S&W SD .40 platform.
Baseplate, Form Factor, and Handling
The SMIA18 uses a removable polymer base assembly tailored to the SD .40 grip and magwell:
Baseplate material: Impact-resistant polymer floorplate / basepad
Removable floorplate: Allows full disassembly of the magazine for cleaning, inspection, and maintenance
Form factor:
Double-stack .40 S&W geometry sized for the SD-series grip and magazine well
Magazine length and profile similar to factory-standard SD .40 magazines, helping ensure proper fit and feeding
The basepad is shaped to facilitate positive seating and easy stripping from the pistol if a malfunction must be cleared, while its smooth edges minimize printing and snag hazards for concealed carry.
Reliability, Origin, and Warranty
ProMag markets the SMIA18 as a durable, U.S.-made aftermarket solution:
Design philosophy: Use of heat-treated steel, chrome-silicon springs, and polymer followers/baseplates to withstand high round counts and frequent training use
Origin: Manufactured in the USA (consistent with ProMag’s general production practices)
Warranty: Covered under ProMag’s lifetime replacement warranty against defects in materials and workmanship, according to the manufacturer’s policy
As with all magazines, users should thoroughly function-test the SMIA18 with their specific S&W SD .40 pistol and preferred ammunition to verify reliable feeding and slide lock-back before employing it in defensive roles.
Typical Use Cases
The ProMag Standard 15rd .40 S&W SMIA18 magazine is suited to a range of applications:
Always confirm that the use and possession of 15-round magazines complies with applicable state and local regulations.
Maintenance and Care
Proper care will help maintain long-term reliability:
Disassembly:
Cleaning:
Wipe or brush carbon, dirt, and debris from the inside of the steel tube
Clean the follower and spring with appropriate, non-corrosive cleaning agents
Lightly oil the exterior steel surface to protect against corrosion (avoid heavy oil inside the tube which can attract debris)
Inspection:
Check feed lips for cracks, bends, or sharp burrs
Inspect the spring for rust or obvious loss of tension
Ensure the follower moves smoothly from fully loaded to empty without binding
Routine cleaning is especially important if the magazine is used in dusty, sandy, or high-volume range environments.
Technical Identification and Catalog Data
For product listings, internal inventory, and SEO-optimized content, the magazine can be identified with the following standardized information:
Product name: ProMag Standard 15rd .40 S&W Fits S&W SD Blued Steel Magazine (Except VE Variant)
Manufacturer: ProMag Industries
Model / Part Number: SMIA18 (often stylized as SMI-A18)
UPC / Barcode: 708279013379
Firearm fit: S&W SD-series .40 S&W pistols (does not fit SD VE variants)
Caliber: .40 S&W
Capacity: 15 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 detachable pistol magazine
These details help align search results for queries such as “ProMag SMIA18 S&W SD .40 15rd mag,” “S&W SD 40 15 round blued steel magazine (not VE),” or direct UPC lookup 708279013379.
In summary, the ProMag Standard 15rd .40 S&W Fits S&W SD Blued Steel Magazine (Except VE Variant) – SMIA18, UPC 708279013379 is a U.S.-made, double-stack 15-round .40 S&W magazine for Smith & Wesson SD-series pistols (excluding SD VE models). It combines a heat-treated blued steel body, chrome-silicon spring, polymer follower, and removable polymer baseplate to deliver a practical replacement or spare magazine for range, training, and defensive roles where a 15-round standard-capacity magazine is suitable and lawful.
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