ProMag COL21 5-Round AR-15 Magazine, .223/5.56x45mm

The ProMag COL21 is a 5-round flush-fit magazine for AR-15 rifles chambered in .223 Remington or 5.56x45mm. It uses a heat-treated steel body with an injection-molded follower and a spring formed from chrome-silicone wire.

Key Specifications

• The magazine is compatible with the AR-15 platform.
• It is designed for .223 Remington and 5.56x45mm chamberings.
• The flush-fit design provides a 5-round capacity.
• The magazine body is constructed from heat-treated steel.
• The follower is made from injection-molded material.
• The spring is formed from chrome-silicone wire.
• This magazine is made in the USA.

With its compact flush-fit profile and steel construction, the COL21 is a practical choice for a spare or replacement magazine setup where a five-round capacity is preferred.