Browning 112025029 BAR 3rd 300 Win Mag Browning BAR MKII/BAR MKIII/BAR LongTrac Long Action Black Metal
http://www.tandktactical.com/shop/023614976004-browning-112025029-bar-3rd-300-win-mag-browning-bar-mkii-bar-mkiii-bar-longtrac-long-action-black-metal-4056
http://www.tandktactical.com/web/image/product.template/4056/image_1920?unique=90b1f6a
This magazine is a detachable box magazine for the BAR and is designed to fit onto the unique hinged floorplate.