This is the 3rd generation M3 PMAG in .300 BLK (300 AAC Blackout).
Magpul has introduced a dedicated magazine with geometry tailored for popular 300 BLK loads for improved feed, rather than shooters having to use 5.56mm magazines.
Usual bomb proof MAGPUL Gen 3 build quality, easy to strip and with a clip on dust cover as standard.
The third generation design features feed lip and spine reinforcements and an improved 4 way anti-tilt follower.
Compatible with all AR-15 and STANAG rifles chambered for 300 BLK.
