Alexander Arms MEB504 AR-15 4rd 50 Beowulf Black Steel
https://www.tandktactical.com/shop/819511020076-alexander-arms-meb504-ar-15-4rd-50-beowulf-black-steel-20739
https://www.tandktactical.com/web/image/product.template/20739/image_1920?unique=693c0bf
4rd, 50 Beowulf magazine is for Alexander Arms AR-15.
