This is a factory Savage Arms Mark II .22LR 10-round magazine. 

A drum magazine may not get much use with your Mark II, but these ten-round magazines definitely will. 

These small but mighty steel magazines feature a high-visibility red follower that provides consistent and reliable feeding. At the base of the magazine, you’ll find a small lip on either side to aid in removing the magazine from your Mark II.

Whether you’re using your Mark II for hunting or just plain range fun, you’ll appreciate having several spare magazines ready to go.

Throw a couple in your cart now and then through a couple in your range bag once they are delivered!