CMMG MK4/AR15 MAGAZINE - 5.7X28MM - 10 ROUND CAPACITY - 32 ROUND BODY - POLYMER - BLACK
CMMG
$48.69
(No reviews yet)
Write a Review
CMMG
CMMG MK4/AR15 MAGAZINE - 5.7X28MM - 10 ROUND CAPACITY - 32 ROUND BODY - POLYMER - BLACK
The CMMG MK4/AR15 5.7x28mm Conversion Magazine delivers a purpose-built feeding solution for shooters running CMMG's Radial Delayed Blowback upper receivers on standard Mil-Spec AR15 lowers, combining California-compliant 10-round capacity with a full-size 32-round polymer body.
- California-legal 10-round capacity housed in a familiar 32-round profile body
- Upgraded feed lips engineered specifically for reliable 5.7x28mm feeding
- Stylized texture grip pattern provides secure, confident handling in all conditions
- Laser-engraved 5.7x28mm caliber marking eliminates any mix-up at the range
- Durable polymer construction keeps weight low without sacrificing strength
- Drop-in compatible with CMMG Radial Delayed Blowback uppers and Mil-Spec lowers
Who This Is For
This magazine is the go-to choice for California-based AR15 owners who have built or purchased a CMMG 5.7x28mm conversion upper and need a reliable, compliant feeding option. It's equally well-suited for competitive shooters, home defenders, and enthusiasts who want the high-velocity, low-recoil advantages of the 5.7x28mm cartridge in a platform they already know, without running afoul of California's magazine capacity regulations.
Specifications
| Brand | CMMG |
|---|---|
| Caliber | 5.7x28mm |
| Capacity | 10 Rounds (CA Compliant) |
| Body Size | 32-Round Profile |
| Material | Polymer |
| Color | Black |
| Compatible Platform | MK4 / Mil-Spec AR15 Lower Receivers |
| Compatible Upper | CMMG 5.7x28mm Radial Delayed Blowback |
| Markings | Laser-Engraved 5.7x28mm |
| Compliance | California 10-Round Blocked Magazine |
Frequently Asked Questions
Will this magazine work with any AR15 lower receiver?
This CMMG 5.7x28mm magazine is designed to work with CMMG MK4 uppers paired with standard Mil-Spec AR15 lower receivers. Because the 5.7x28mm cartridge requires a dedicated upper receiver with a CMMG Radial Delayed Blowback bolt and barrel, the magazine will not function correctly with a standard 5.56/.223 upper — the caliber-specific feed lips and geometry are matched to CMMG's conversion system only.
Why does a 10-round magazine have a 32-round body?
CMMG's 5.7x28mm magazines are built on a 32-round-sized body to maintain the proper geometry and feeding angle needed for reliable function with their Radial Delayed Blowback upper receivers. The magazine is permanently blocked and pinned to California's legal 10-round limit at the factory, making it compliant for sale and use in California while retaining the ergonomic feel and reliable feeding of the full-size design.
Can I use this magazine outside of California — is 10 rounds the only option?
CMMG offers these 5.7x28mm AR conversion magazines in both a standard 10-round version and a higher-capacity 10/32 version (blocked to 10 rounds for restricted states). If you are purchasing for use in a state without magazine capacity restrictions, check with Goodland Guns or CMMG directly about availability of unrestricted capacity options, as state laws vary. The 10-round blocked version sold here is specifically configured for California compliance.
- Caliber:
- 57x28mm
- Capacity:
- 10/32 Round
- Color:
- Black
- Follower Color:
- Red
- Type:
- Rifle Magazine
- CA Compliant:
- Yes
- Platform:
- MK4 / AR-15
- Material:
- Polymer
