ProMag COL21 5rd Flush-Fit Magazine AR-15 .223/5.56

The ProMag COL21 is a low-profile, flush-fit spare or replacement magazine designed for AR-15 platforms chambered in .223 Rem / 5.56x45mm. It provides a compact, factory-length option for users who need a minimal protrusion from the magazine well. The magazine body is constructed from heat-treated steel and uses an injection-molded follower and a spring formed from chrome-silicone wire. This item is manufactured in the USA.

Key Specifications

• The magazine is a flush-fit design for a low-profile installation.
• Compatible with the AR-15 platform.
• Chambering supported: .223 Rem / 5.56x45mm.
• Capacity: 5 rounds.
• Body material: heat-treated steel.
• Model: Standard (COL21).
• Follower type: injection-molded.
• Spring construction: chrome-silicone wire.
• Country of manufacture: USA.

For users who value a compact, dependable magazine that preserves the original profile of the rifle, the COL21 provides a straightforward, well-built option. Its heat-treated steel construction and robust internals make it suitable as a spare or replacement magazine for range use and everyday carry setups that require a flush-fit magazine.