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Promag
The ProMag COLA4 is a 20-round detachable magazine purpose-built for AR-15 rifles chambered in .223 Remington and 5.56x45mm NATO. If you run a modern tactical rifle, a competition gun, or a hunting AR, you need reliable ammunition storage that performs under pressure — and that's exactly what this magazine delivers. The COLA4 gives you a proven capacity option that balances firepower with practical handling, whether you're at the range, in the field, or working through drills.
Built from heat-treated blued steel, the magazine body is engineered to withstand rough use without losing zero or function. The black oxide finish resists corrosion and wear, holding up to the kind of abuse that comes with regular shooting and field work. Inside, a chrome-silicon wire spring and precision-molded polymer follower work together to ensure rounds feed reliably, round after round. This is American-made hardware you can trust.
The COLA4 pairs the durability of steel construction with a proven spring design, making it a solid backup magazine choice or a workhorse for shooters who want dependable 20-round capacity without fuss. Whether you're stocking up for a long range day or building a magazine rotation for your duty or hunting rifle, this one does the job.
| Capacity | 20 rounds |
| Caliber Compatibility | .223 Remington / 5.56x45mm NATO |
| Platform | AR-15 |
| Magazine Type | Detachable |
| Body Material | Heat-treated steel |
| Finish | Black oxide (blued) |
| Spring | Chrome-silicon wire |
| Follower | Precision-molded polymer |
| Country of Origin | U.S.A. |
The ProMag COLA4 is designed for AR-15 rifles chambered in .223 Remington or 5.56x45mm NATO. If your rifle is in either of those calibers and uses standard AR-pattern magazines, this will fit and function properly.
Steel magazines like the COLA4 are built to take punishment in the field. The heat-treated blued steel body resists damage from impact and drops, and the black oxide finish protects against corrosion. They're heavier than polymer, but they last longer under hard use.
The product information provided does not specify condition. Contact Bosque Outdoors directly to confirm whether this is new or surplus stock.
Some shooters prefer 20-round magazines for hunting, reduced weight and profile on a rifle slung for extended periods, or legal compliance in certain jurisdictions. The COLA4 gives you that capacity in a durable steel package.
Promag
The ProMag COLA4 is a 20-round detachable magazine purpose-built for AR-15 rifles chambered in .223 Remington and 5.56x45mm NATO. If you run a modern tactical rifle, a competition gun, or a hunting AR, you need reliable ammunition storage that performs under pressure — and that's exactly what this magazine delivers. The COLA4 gives you a proven capacity option that balances firepower with practical handling, whether you're at the range, in the field, or working through drills.
Built from heat-treated blued steel, the magazine body is engineered to withstand rough use without losing zero or function. The black oxide finish resists corrosion and wear, holding up to the kind of abuse that comes with regular shooting and field work. Inside, a chrome-silicon wire spring and precision-molded polymer follower work together to ensure rounds feed reliably, round after round. This is American-made hardware you can trust.
The COLA4 pairs the durability of steel construction with a proven spring design, making it a solid backup magazine choice or a workhorse for shooters who want dependable 20-round capacity without fuss. Whether you're stocking up for a long range day or building a magazine rotation for your duty or hunting rifle, this one does the job.
| Capacity | 20 rounds |
| Caliber Compatibility | .223 Remington / 5.56x45mm NATO |
| Platform | AR-15 |
| Magazine Type | Detachable |
| Body Material | Heat-treated steel |
| Finish | Black oxide (blued) |
| Spring | Chrome-silicon wire |
| Follower | Precision-molded polymer |
| Country of Origin | U.S.A. |
The ProMag COLA4 is designed for AR-15 rifles chambered in .223 Remington or 5.56x45mm NATO. If your rifle is in either of those calibers and uses standard AR-pattern magazines, this will fit and function properly.
Steel magazines like the COLA4 are built to take punishment in the field. The heat-treated blued steel body resists damage from impact and drops, and the black oxide finish protects against corrosion. They're heavier than polymer, but they last longer under hard use.
The product information provided does not specify condition. Contact Bosque Outdoors directly to confirm whether this is new or surplus stock.
Some shooters prefer 20-round magazines for hunting, reduced weight and profile on a rifle slung for extended periods, or legal compliance in certain jurisdictions. The COLA4 gives you that capacity in a durable steel package.
