This is the ProMag Browning Buck Mark .22 LR 10-round magazine. 

There is nothing left to be desired from this 10-round ProMag magazine for the Browning Buck Mark. 

With a rugged steel construction and a polymer follower, this magazine easily achieves a combination of durability and reliability. To make these magazines even easier to load, you’ll find a side-facing button, which means you’ll also have a channel to view your remaining rounds!

The Browning Buck Mark is a fan favorite for a weekend of plinking or varmint control, so pre-load your magazines and stay ready for either!

Since these are only 10-round magazines, you might as well buy a few to save time on reloading!