This is the flush fitting 3 round .223 Remington factory magazine for the Anschutz 1770 series rifles (1770-U3 010310). Made from a tough polymer it is also strippable for cleaning.
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.
Any ammunition pictured is for display purposes and is not included.