This replacement magazine is a factory original from Magpul Industries. Designed to fit the AR-15 rifle. Built to hold (30) rounds of ammunition. Will only hold 300 AAC Blackout rounds. Constructed of next-generation impact and crush resistant polymer. This magazine also comes equipped with a hi-tensile compression steel spring to assure this magazine has minimal to no friction, and smooth feeding responses.

The PMAG® 30 AR 300 B GEN M3™ is a purpose-designed magazine for rifles chambered in 300 Blackout®. Since its inception, 300 Blackout shooters have had to use a magazine designed for another cartridge, limiting its ultimate performance and compatibility. One of the nice features of 300 Blackout is the compatibility with 5.56x45mm parts, but with the magazine it is a compromise to do so. Due to the wide variety of projectile weights and profiles potentially decreasing overall reliability, a dedicated 300 Blackout magazine was a logical step for the PMAG line.

The PMAG® 30 AR 300 B GEN M3™ is a purpose-designed magazine for rifles chambered in 300 Blackout®. Since its inception, 300 Blackout shooters have had to use a magazine designed for another cartridge, limiting its ultimate performance and compatibility. One of the nice features of 300 Blackout is the compatibility with 5.56x45mm parts, but with the magazine it is a compromise to do so. Due to the wide variety of projectile weights and profiles potentially decreasing overall reliability, a dedicated 300 Blackout magazine was a logical step for the PMAG line.

The PMAG 30 AR 300 B GEN M3 is a dedicated magazine for rifles chambered in 300 Blackout. While standard AR-15 magazines may be used for this cartridge, the potential danger exists to chamber and fire a 300 Blackout round in a 5.56 NATO chamber with catastrophic results.Optimized for 300 AAC Blackout, the PMAG 30 AR 300 B retains all the GEN M3 features adding a distinct rib design and smoother upper texture to set them apart from other PMAGs for quick visual and tactile identification. This AR mag is easy to disassemble and clean for regular maintenance and won't fail you in the field.