The .308/7.62 x 51 mm AM Box magazine is used in the MPA BA Chassis system and other OEM rifle manufacturers such as Remington Arms, Savage Arms, McMillan Rifles, and several others, as well as operators and practical shooters all around the world. This magazine has also been chosen by Ruger to be the OEM magazine for their extremely popular gunsite scout rifle. We are committed to making the best .308 magazine that money can buy. The entire 308 family of cartridges can be used with this magazine including .243Win, .260 Rem and 22-250, 6mm and 6.5mm. 2.950 Max OAL.