This is the ATI Bulldog 410 gauge 10-round magazine.

Crafted from impact-resistant polymer, this ATI Bulldog magazine is built to perform under demanding conditions. Its anti-tilt polymer follower ensures smooth feeding, while flared feed lips enhance reliability and ease of loading. The 10-round capacity is ideal for extended shooting sessions or home defense. Specifically designed for a flawless fit with the ATI Bulldog in .410 gauge, this magazine delivers the performance and reliability you need shot after shot.