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The ProMag COL-A22B brings you high capacity without the premium price tag. This 42-round magazine fits AR-15 and M16 rifles chambered in .223 Remington and 5.56x45mm NATO, giving you plenty of rounds to minimize reloads during range sessions or training.
Instead of steel, ProMag machines these magazines from a proprietary DuPont Zytel-based polymer. This stuff actually holds up remarkably well. Zytel is a high-performance nylon that resists impact and abrasion better than you might expect from polymer construction. The desert tan finish blends in with coyote and tan AR setups while standing up to corrosion and UV exposure. The magazine body and injection-molded follower are both made from this polymer, keeping the whole assembly lightweight but durable enough for extended use.
The real workhorse of any magazine is the spring, and ProMag didn't cheap out here. The spring is heat-treated chrome silicon wire, the same material you'll find in higher-end magazines. Heat treating this material gives it exceptional resistance to fatigue, meaning it maintains consistent pressure on your rounds cycle after cycle, even after sitting loaded for extended periods. Paired with the injection-molded follower, this setup ensures rounds feed smoothly without tilting or hanging up. Customers have reported solid performance with budget ammo and quality ammunition alike, with most noting reliable feeding through hundreds of rounds.
This magazine is manufactured stateside at ProMag's Arizona facility and comes with a lifetime warranty against manufacturer defects. That kind of coverage signals confidence in the product, and it means if something does go wrong, you're covered.
The ProMag COL-A22B is designed and tested for .223 Remington and 5.56x45mm NATO. While some similar ProMag magazines in other product lines accommodate .300 Blackout, we recommend sticking with .223/5.56 for this model to ensure reliable feeding.
The ProMag uses DuPont Zytel polymer instead of steel, which makes it significantly lighter while still offering excellent durability. The tradeoff is that polymer can be more susceptible to UV damage over very long periods in direct sunlight compared to steel, but the Zytel formulation resists this better than basic polymers. Most shooters find the weight savings and corrosion resistance of polymer worth the difference.
The magazine is rated for 42 rounds. That said, many users report better reliability by loading 40 rounds, as this reduces spring pressure at maximum capacity. Some load the full 42 without issues, so it may depend on your specific rifle's tolerances and how hard you're willing to work the spring.
ProMag's lifetime warranty covers manufacturer defects in materials and workmanship. If your magazine develops a crack, a faulty follower, or spring failure due to a manufacturing issue, you can return it to ProMag for replacement. Normal wear from use is not covered.
| UPC | 708279012686 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | COL-A22B |
| Brand Fit | AR-15 Platform |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 40 |
| Length | 7 |
| Model | |
| Model Fit | AR-15 |
| Package Height | 1.2 |
| Package Width | 4.4 |
| Product Type | Accessory-Magazines |
| Shipping Weight | 0.4 |
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