This is the factory CZ P-09 F Nocturne 9mm 19-round magazine. 

You will not have to worry about capacity with these genuine CZ 19-round magazines!

With a durable steel body and an anti-tilt polymer follower, your 19 rounds will be well-protected and feed flawlessly. To make sure you don’t lose track of your remaining rounds, you’ll find numbered, rear-facing witness holes for quick and easy visual assessments. 

From home defense to competitions, you’ll be well-served to have some additional magazines to maximize your overall capacity.

A few 19-round magazines should do the trick for most applications, so treat yourself and add a few to the cart!