Taurus manufactured this magazine for their 840 Compact .40 S&W.
The maximum capacity for this magazine is (11) rounds. Taurus designed this magazine for .40 S&W caliber rounds. This factory magazine has a blued steel housing, and a black polymer base pad for added support.
Keeping a few extra factory magazines around is never a bad idea; extra magazines save loading time at the range and also serve as a backup for those days when you simply cannot remember where you put your primary magazine.