15/20 Magpul PMAG 30 AR 300 B GEN M3 300 Blackout Magazine – Black
Caliber: 7.62×35 / 300 Blackout
Capacity: 15 rounds (in a permanently modified 20 round magazine body)
Color: Black
Compatability: Specifically designed for 300 BLACKOUT rounds in AR15 platform
Optional Upgrades:
- Install Black Ranger Plate – aids in pulling magazines out of inverted mag pouches.
- Install Tan Baseplate – Acts as a monopod for prone / bench rest shooting (subject to availability).
Modification Details:
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Permanently modified to 15 rounds with our proprietary internal limiter. Base sealed with industrial-grade polymer adhesive — no rivets or pins. Magazine cannot be disassembled. Spring maintains full length of travel inside magazine for reliability.
About the PMAG 20 AR 300 B GEN M3:
- Purpose-built for 300 Blackout for improved feeding and reliability.
- Unique rib design prevents cross-loading with 5.56 magazines.
- Features next-gen impact- and crush-resistant polymer construction.
- Aggressive texture for secure handling.
- Paint pen dot matrix for easy identification.


Anonymous (verified owner) –
Magazine is awesome and just what I needed for living in Colorado with the 15 rd capacity limit. Calegalmags is my go to magazine provider.
Anonymous (verified owner) –
CA Legal Mags is my go-to for CO legal mags. I love that they’re just modified MagPul 3s.
Bruce Williamson (verified owner) –
Works great! Fast shipping