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.The pmag 20 ar 300 b's distinct ribbed design and smoother upper-half texture provides the shooter a distinct visual and tactile difference from any other pmag to mitigate dangerous cross-loading issues.Made in the usa.Caliber: 300 BlackoutCapacity: 20rdModel: PMAGMaterial: PolymerModel Fit: AR-PlatformCapacity: 20