Magpul PMAG 20 AR 300B Gen M3 Magazine
Magpul's 20-round PMAG for 300 Blackout AR platforms. Durable polymer construction with reliable feeding and witness holes for round count verification.
Magpul PMAG 20 AR 300B Gen M3
The PMAG 20 AR 300B Gen M3 is a purpose-built magazine for 300 Blackout AR-15 rifles. Magpul engineered this magazine specifically for the dimensional requirements of 300 Blackout ammunition, ensuring reliable feeding and consistent performance.
Key Features
- 20-round capacity optimized for 300 Blackout cartridges
- Durable polymer construction resists impact and environmental degradation
- Witness holes along the body allow quick visual verification of round count
- Aggressive texturing provides positive grip even with gloved hands
- Reinforced feed lips maintain consistent ammunition presentation
- Gen M3 platform represents Magpul's latest magazine technology
- Compatible with standard AR-15 platforms chambered in 300 Blackout
Performance and Reliability
The Gen M3 design incorporates lessons learned from extensive field testing. The magazine's internal geometry is precisely matched to 300 Blackout dimensions, preventing the feeding issues that can occur when using standard 5.56 magazines with subsonic ammunition.
Whether you're running a suppressed 300 Blackout for hunting or tactical training, this magazine delivers the dependable performance serious shooters expect from Magpul.
