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The COL-A4 is a straightforward 20-round AR magazine built with serious durability in mind. If you prefer the weight and longevity of a steel magazine over polymer, this is a solid choice that won't break the bank.
The magazine body starts with high-carbon heat-treated steel and is TIG-welded for structural strength. Steel mags handle rough treatment better than polymer counterparts, and they're less prone to warping in temperature extremes. You're getting a magazine that can take the bumps and drops that come with regular use without losing shape. The finish is a black oxide coating that resists corrosion in the field.
Inside, you'll find a precision-molded polymer follower paired with a chrome-silicon wire spring. These materials are engineered to work together and keep rounds feeding smoothly. The follower ensures cartridges stay aligned and move up consistently, while the heat-treated spring maintains its tension through thousands of cycles. This is the same spring technology ProMag uses across their entire magazine lineup.
The COL-A4 is manufactured domestically and comes with ProMag's lifetime warranty against defects. That backing gives you confidence that ProMag stands behind their product. At 20 rounds, you get a capacity that balances shootability with maneuverability, making it useful for training, target shooting, or as a backup on your rifle.
Yes, this magazine is designed for any AR-15 rifle chambered in .223 Rem or 5.56x45mm NATO. It fits standard AR-15 platform rifles and carbines. The 20-round capacity makes it slightly more compact than standard 30-rounders while still offering solid firepower for training and range use.
Steel magazines are heavier than polymer, but they handle drops and rough treatment better and resist deformation. The trade-off is weight. Steel mags maintain their feed lip geometry and won't warp in heat, making them popular for heavy use and storage. Polymer mags are lighter but need care to protect the feed lips.
Yes. The heat-treated chrome-silicon spring in the COL-A4 is designed to maintain consistent tension over time. You can store it loaded without concern about spring fatigue affecting performance.
The package includes just the magazine itself. No accessories, loaders, or cases are included. The magazine is ready to fill with ammunition and load into your rifle.
| UPC | 708279006555 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | COLA4 |
| Brand Fit | AR-15 Platform |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 20 |
| Model | |
| Model Fit | AR-15 |
| Product Type | Detachable |
| Shipping Weight | 0.4 |
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