This is a Browning® Buckmark 10-round magazine in .22 LR
Crafted from lightweight metal with steel internal springs and easy-to-use reloading buttons, these factory magazines are the perfect upgrade for your Browning Buckmark pistol. Browning’s Buckmark is an affordable, ultra-reliable target pistol with decades of heritage and a track record of proven performance. These 10-round improved magazines are designed to optimize rimfire feeding for ultimate reliability. Nothing makes your Buckmark more fun to shoot than a few spare magazines, giving you more trigger time on the range and ensuring maximum reliability with any type of rimfire ammo.