Magpul PMAG 20 AR 300 B Gen M3 Rifle Magazine 300 AAC BLK 20/Rd

The PMAG 20 AR 300 B GEN M3 is a purpose-built magazine for rifles chambered in .300 Blackout (300 BLK). Similar in every way to our PMAG 30 AR 300 B the PMAG 20 is more compact for increased maneuverability and creates a more concealable package for use in small format firearms.

Since its inception 300 BLK shooters have had to use a magazine designed for another cartridge limiting that round’s ultimate performance and compatibility. One of the key features of 300 BLK in the past has been its compatibility with 5.56x45mm magazines. However even with moderate success with that particular magazine it is a compromise to do so with reliability and safety both being at risk.

In addition to the performance