This is the 5 round magazine for Anschutz 1780 series rifles in .30-06, 8x57 IS, 7.92x57mm and 9.3x62mm (1780-U5 011641), precision made from blued steel and a tough polymer.
You can’t go wrong with having extra magazines, whether it’s for quick loading times at the range or in the field. Or, as a backup in case you lose one or drop one in the mud.