User Ratings
No ratings yet
Be the first to review this product
ProMag COL21: This flush-fit replacement magazine for AR-15 rifles chambered in .223/5.56x45mm. The body is constructed of heat treated steel with a black oxide finish for durability. Its chrome-silicon wire spring and precision molded polymer follower ensure reliable feeding and function. COL 21 A 5-rd Magazine for AR-15 rifles chambered in .223cal/5.56x45mm. Magazine body constructed of heat treated steel with a black oxide finish for durability and harsh use in the field.
Specifications
- Manufacturer:
- Promag
- Category:
- magazine
- Caliber:
- 5.56x45mm NATO
- Platforms:
- AR-15
- Weight:
- 5.6 oz
- UPC:
- 8228121313402
- MPN:
- COL21
- Required Component:
- No
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$17.95
Lowest
$17.95
Highest
$29.98
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertBundle Package
This is a bundled product that includes multiple components. The exact contents may vary - check the product description for more details.
• Complete assembly ready to use
• Multiple components included
• Value package pricing
Similar Products
Magpul PMAG GEN M3 AR-15/M16/M4 Magazine 5.56 NATO 30 Round
Magpul
$11.99
Magpul PMAG 10/30 AR/M4 GEN M3 10-Round Magazine, Black 5.56x45 NATO/.223 Rem
Magpul
$13.87
Magpul PMAG GEN M2 5.56mm 30-Round FDE Magazine with Window
Magpul
$11.88
Magpul MAG556-ODG Windowed PMAG 30 Gen M3 5.56/.223 Polymer Magazine OD Green
Magpul
$17.05
Magpul PMAG GEN M3 5.56x45/.223 30rd Window Rifle Magazine - MultiCam Black
Magpul Industries
$13.34
DuraMag Speed AR-15 Magazine 30rd Black Orange Follower
Duramag
$18.49
Magpul PMAG 30 Gen M3 AR-15 Magazine 5.56x45 NATO / .223 Remington
Magpul
$14.95
Magpul PMAG AR/M4 Gen M2 MOE 5.56x45 NATO AR-15 Magazine
Magpul
$9.94
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
AK Magazine Fit, Lockup, and Reliability Basics
A practical guide to AK magazine fit, front-to-back lockup, and how magazine variation affects feeding, bolt travel, and real-world reliability.
5 min read
Guide
The AK Platform: Core Design, Strengths, and Builder Tradeoffs
A practical AK overview covering operating system basics, parts ecosystem realities, and where the AK platform shines compared to AR-pattern rifles.
8 min read
Guide
AR-15 Caliber Options Beyond 5.56: What Changes and Why
A neutral overview of common AR-15 caliber paths beyond 5.56, including .300 Blackout, 6.5 Grendel, and .22 LR conversion approaches with practical system tradeoffs.
4 min read