ProMag COLA27 27-Round 6.8 SPC Magazine AR-15/M16 Blued Steel

The ProMag COLA27 extends AR-15/M16 platform capabilities with 27 rounds of 6.8mm Remington SPC ammunition in a single magazine. This high-capacity magazine addresses the need for sustained fire capability while maintaining the enhanced terminal ballistics of the 6.8 SPC cartridge. Built from blued steel construction, it delivers the durability required for demanding applications.

What Makes This Different

Unlike standard 20 or 30-round 5.56 magazines, the COLA27 maximizes the 6.8 SPC's superior ballistic performance with extended capacity. The blued steel construction provides corrosion resistance and structural integrity that polymer alternatives cannot match. Heat-treated steel components maintain feed lip geometry under stress, ensuring consistent chambering across all 27 rounds. This magazine fills the gap between standard capacity and drum magazines without the bulk penalties.

Key Features

• 27-round capacity for 6.8mm Remington SPC ammunition
• Blued steel construction with corrosion-resistant finish
• Compatible with AR-15 and M16 platform rifles chambered in 6.8 SPC
• Heat-treated steel feed lips maintain geometry under repeated use
• Anti-tilt follower design prevents double feeds and misfeeds
• Removable floorplate for maintenance and cleaning access
• Witness holes for round count verification

Field performance centers on the magazine's ability to cycle the higher-pressure 6.8 SPC cartridge reliably. The steel construction handles the increased bolt thrust and extraction forces better than polymer magazines. Competition shooters benefit from the extended capacity during multi-target engagements, while tactical applications gain sustained fire capability. The magazine functions in temperature extremes from -20°F to 140°F without feed issues.

Technical Specs

• Capacity: 27 rounds
• Caliber: 6.8mm Remington SPC
• Material: Blued carbon steel body and components
• Compatibility: AR-15/M16 platform rifles in 6.8 SPC
• Overall length: Approximately 7.8 inches
• Weight: 8.2 ounces empty
• Follower: Anti-tilt polymer design
• Spring: Chrome silicon wire construction

The COLA27 represents a practical solution for shooters requiring extended capacity with 6.8 SPC performance advantages. Steel construction ensures longevity that justifies the investment over multiple range sessions and field use. ProMag's manufacturing standards deliver consistent feeding across various 6.8 SPC loads and bullet weights.