The ProMag COLA4 delivers reliable 20-round capacity for AR-15 platforms in a traditional blued steel construction. This standard-profile magazine provides shooters with proven feeding performance while maintaining the classic aesthetic of steel construction.
What Makes This Different
The COLA4 features blued steel construction that offers enhanced durability compared to standard aluminum magazines. The 20-round capacity strikes an optimal balance between ammunition supply and manageable weight, making it particularly suitable for precision shooting applications where prone positioning benefits from reduced magazine length. Steel construction provides superior resistance to denting and deformation under heavy use.
Key Features
- 20-round capacity optimized for both .223 Remington and 5.56x45mm NATO
- Blued steel body construction for enhanced impact resistance
- Standard STANAG 4179 compatibility fits all AR-15 pattern rifles
- Anti-tilt follower design ensures consistent cartridge presentation
- Heat-treated steel spring maintains tension through extended use
- Removable floorplate allows for easy cleaning and maintenance
- Standard profile fits existing magazine pouches and carriers
Field testing demonstrates consistent feeding across various ammunition weights from 55-grain to 77-grain projectiles. The steel construction maintains dimensional stability in temperature extremes while the blued finish provides corrosion resistance in humid conditions. Competition shooters appreciate the reduced profile for prone shooting positions, while the robust construction handles repeated loading cycles without spring fatigue.
Technical Specs
- Capacity: 20 rounds
- Caliber: .223 Remington/5.56x45mm NATO
- Construction: Blued carbon steel body
- Compatibility: AR-15, M16, and STANAG 4179 platforms
- Overall Length: Approximately 7.5 inches
- Weight: 4.2 oz (empty)
- Follower: Anti-tilt polymer design
- Spring: Heat-treated steel
The ProMag COLA4 represents solid engineering focused on feeding reliability and structural integrity. Steel construction ensures this magazine maintains performance standards through thousands of loading cycles, making it a dependable choice for shooters who prioritize proven materials and consistent function.