This is a Remington factory replacement magazine for the Remington 710/770. This is a standard replacement box magazine designed to fit short-action caliber 7mm-08 Remington, .243 Winchester and .308 Winchester cartridges. The magazine is made from steel and features a blued finish. Be prepared and keep spare magazines handy for extra firepower or to ensure you don't get stuck with a malfunctioning or worn out magazine and no backup by having this Remington 710/770 detachable box magazine at the ready.