MAGPUL PMAG M3 AR-15 MAGAZINE - 300 BLK - 10 ROUND CAPACITY - 30 ROUND BODY - BLACK
Magpul Industries
$17.99 - $20.69
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Magpul Industries
MAGPUL PMAG M3 AR-15 MAGAZINE - 300 BLK - 10 ROUND CAPACITY - 30 ROUND BODY - BLACK
The Magpul PMAG 30 AR 300 B GEN M3 is the first magazine purpose-built for the 300 Blackout cartridge, now available in a California-compliant 10-round configuration — delivering dedicated reliability without the compromises of adapted 5.56 magazines.
- Purpose-designed for 300 Blackout — not a modified 5.56 magazine
- Permanently blocked to 10 rounds via proprietary block and rivet
- GEN M3 polymer construction for superior strength and durability
- Optimized feed geometry supports wide range of 300 BLK projectile weights
- Compatible with standard AR-15 lower receivers and mil-spec magwells
- Includes dust cover, anti-tilt follower, and stainless steel spring
Who This Is For
This magazine is the ideal choice for California-based AR-15 owners running 300 Blackout builds who demand purpose-built feeding reliability. Whether you're shooting supersonic hunting loads or subsonic suppressed rounds, the PMAG 30 AR 300 B GEN M3 handles the full spectrum of 300 BLK projectile profiles — making it a must-have upgrade for any dedicated 300 Blackout rifle owner who refuses to compromise on performance within state capacity laws.
Specifications
| Brand | Magpul Industries |
|---|---|
| Model | PMAG 30 AR 300 B GEN M3 |
| Caliber | 300 Blackout (.300 BLK) |
| Capacity | 10 Rounds (30-Round Body) |
| Compliance | California / Restricted State Legal |
| Block Method | Proprietary Block & Rivet (Permanent) |
| Material | High-Strength Polymer |
| Follower | Anti-Tilt, Self-Lubricating |
| Spring | Stainless Steel |
| Includes | Dust / Impact Cover |
| Color | Black |
| Compatible Platforms | AR-15 / M4 Mil-Spec Magwell |
Frequently Asked Questions
Why do I need a dedicated 300 Blackout magazine instead of using a standard 5.56 PMAG?
While 300 Blackout shares the same case head as 5.56x45mm and fits in standard AR-15 magazines, using a 5.56-optimized magazine with 300 BLK is a compromise. The wider variety of bullet weights and ogive profiles used in 300 Blackout — especially heavy subsonic loads — can cause feed reliability issues in magazines tuned for 5.56 geometry. The PMAG 30 AR 300 B GEN M3 features feed lips and internal geometry specifically engineered for 300 BLK, improving reliability across the full spectrum of supersonic and subsonic ammunition.
Is the 10-round block permanent, and can the magazine be restored to 30 rounds?
Yes, the capacity restriction is permanent. Magpul uses a proprietary block and rivet system specifically designed to prevent removal or modification. Attempting to defeat the block is illegal under California law and would render the magazine non-compliant. This magazine is sold exclusively as a 10-round unit for use in California and other states with magazine capacity restrictions.
Will this magazine work with both suppressed subsonic and unsuppressed supersonic 300 Blackout loads?
Yes. One of the primary design goals of the PMAG 30 AR 300 B GEN M3 was reliable feeding across the wide range of projectile weights used in 300 Blackout — from lightweight 110–125 grain supersonic loads to heavy 200–220 grain subsonic rounds optimized for suppressed fire. The dedicated feed geometry and anti-tilt follower help ensure consistent presentation of all standard 300 BLK cartridges into the chamber, regardless of bullet profile.
- Capacity:
- 10/30 Round
- Caliber:
- 300 BLK
- Color:
- Black
- Follower Color:
- Gray
- Type:
- Magazine
- CA Compliant:
- Yes
- Platform:
- AR-15
- Material:
- Polymer
