The ProMag Steel Handgun Magazine for Sig Sauer P290 9mm – 6-Round, Blued Finish, Model SIG 18 / SIG18, UPC 708279013294 is a compact, single-stack replacement or spare magazine engineered specifically for the SIG Sauer P290 9mm pistol platform. Built with a heat-treated steel body, black/blued oxide finish, chrome-silicon spring, and injection-molded polymer follower and baseplate, this 6-round magazine is designed to provide reliable feeding performance in a slim profile optimized for concealed carry and backup use.
Platform Compatibility and Capacity
This ProMag SIG18 magazine is tailored for the subcompact Sig Sauer P290 series:
Compatible firearm: Sig Sauer P290 9mm pistols (and P290 variants chambered in 9×19mm)
Caliber: 9mm Luger (9×19mm Parabellum)
Capacity: 6 rounds (6+1 when one round is chambered)
Configuration: Single-stack box magazine
The 6-round capacity and compact overall length keep the magazine flush or near-flush with the P290 grip frame (depending on specific basepad style), making it appropriate for primary concealed carry or use as a low-profile backup magazine.
Magazine Body, Material, and Finish
The core of the SIG18 magazine is its steel tube construction:
Body material: Heat-treated steel for structural rigidity and resistance to denting
Construction: Stamped and welded steel body designed to maintain consistent internal geometry for smooth feeding
Finish: Blued / black oxide finish, providing corrosion resistance and a low-glare, matte appearance that blends with typical P290 slide and frame finishes
This steel body is built to withstand everyday carry conditions such as holster contact, perspiration, and repeated insertion/removal from the magwell.
Internal Components: Follower and Spring
To support dependable operation over many load cycles, ProMag equips the SIG18 with robust internal components:
Together, the steel body, polymer follower, and chrome-silicon spring work to promote reliable feeding, consistent slide lock-back on empty, and long-term service life when the magazine is properly maintained.
Baseplate, Form Factor, and Handling
The SIG18 uses a compact base assembly that complements the concealed-carry dimensions of the P290:
Baseplate material: Impact-resistant polymer floorplate/basepad
Detachable floorplate: Allows the magazine to be disassembled for cleaning, inspection, and internal maintenance
Profile:
Designed to fit the P290 grip frame with minimal additional length
Smooth, snag-resistant exterior to support concealed carry in pockets, belt holsters, or magazine pouches
This compact form factor makes the 6-round SIG18 magazine a practical choice for deep concealment or as a backup mag carried on the opposite side of the body.
Reliability, Origin, and Warranty
ProMag highlights durability and user support as key aspects of their magazine line:
Design approach: Utilizes heat-treated steel tubes, chrome-silicon springs, and polymer followers/baseplates to withstand heavy use in training and daily carry
Origin: Made in the USA
Warranty: Covered by ProMag’s lifetime replacement warranty against defects in materials and workmanship (per ProMag’s standard policy)
As with any magazine, shooters should thoroughly function-test the SIG18 in their specific P290 pistol with their chosen ammunition and maintain the magazine with regular cleaning and inspection.
Typical Use Cases
The ProMag Steel Handgun Magazine Sig Sauer P290 9mm Blued 6rd SIG18 is suitable for several roles:
Primary concealed-carry magazine: Slim 6-round mag that maintains compact grip length for minimal printing under clothing
Backup/secondary magazine: A lightweight spare carried in a pocket or mag pouch for additional ammunition in defensive or off-duty contexts
Training and range use: Extra mags help reduce reload downtime during drills and practice sessions
Users must always follow local laws concerning magazine capacity and firearm transport/storage.
Technical Identification and Catalog Data
For ecommerce listings, inventory systems, and SEO-oriented product pages, this magazine can be described with the following standardized attributes:
Product name: ProMag Steel Handgun Magazine Sig Sauer P290 9mm Blued 6-Round
Manufacturer: ProMag Industries
Model / Part Number: SIG 18 / SIG18
UPC / Barcode: 708279013294
Firearm fit: Sig Sauer P290 9mm
Caliber: 9mm Luger (9×19)
Capacity: 6 rounds
Body material: Heat-treated steel
Finish: Blued / black oxide
Follower: Injection-molded polymer
Spring: Heat-treated chrome-silicon wire
Baseplate: Polymer, removable
Configuration: Single-stack subcompact pistol magazine
Including these details supports accurate search indexing for phrases like “ProMag SIG18 P290 6rd magazine,” “Sig Sauer P290 9mm 6 round blued steel mag,” or lookup by UPC 708279013294.
In summary, the ProMag Steel Handgun Magazine Sig Sauer P290 9mm Blued 6/rd (SIG 18 / SIG18, UPC 708279013294) is a U.S.-made, 6-round single-stack 9mm magazine constructed from heat-treated blued steel with a chrome-silicon spring, polymer follower, and removable polymer baseplate, designed as a compact, reliable replacement or spare magazine solution for SIG Sauer P290 pistols used in concealed-carry, backup, and training roles.
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