This replacement magazine is a factory original from Beretta. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation.
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.
Note: 17 round magazines include a +3 baseplate. Magazine spring may be stiff and require some time to loosen up to accept all rounds.