This KCI USA magazine (mfr. part no. KCI-MZ066) holds 21 rounds of .223 Remington/5.56 NATO and fits the AR-15 platform. It’s molded in a translucent smoke polymer, letting you check your remaining round count without pulling the magazine to look. A 21-round capacity splits the difference between a standard 20-round and a full 30-round AR magazine, giving shooters in capacity-restricted states or those who just prefer a shorter body a solid middle-ground option.

Key Specifications

• Holds 21 rounds of .223 Remington/5.56 NATO.
• Fits the AR-15 platform.
• Translucent smoke polymer body for at-a-glance round counting.
• Weighs about 0.3 lb.
• Manufactured by KCI USA.

Frequently Asked Questions

What rifles does this magazine fit? AR-15 platform rifles chambered in .223 Remington/5.56 NATO.

Can I see how many rounds are loaded without removing the magazine? Yes, the translucent smoke polymer body lets you check your round count at a glance.

Buy the KCI USA AR-15 .223/5.56 21-Round Magazine – Translucent Smoke

Order the KCI USA AR-15 .223/5.56 21-Round Magazine – Translucent Smoke from our Lubbock, Texas gun shop for fast, insured shipping to your FFL. Browse more AR-15 magazines at Schaefer Defense.