This is a Butler Creek Magazine chambered in 22 LR, model BCA22LR25.
Get the most out of your Savage A-Series rifle with one of Butler Creek's 25-round magazines. It features a stainless steel spring and all metal header and feed lips for reliable feeding. A remaining round indicator on the side lets you know when the magazine is running short of rounds. These A-Series 25-round magazines gives you more time behind the rifle" and less time reloading.
Features:
Reliable Feeding
Anti-Tilt Follower
Stainless Steel Spring
Loading Assist Lever