This is the factory Beretta PX4 Storm Compact 10-round magazine in .40 S&W. 

Beretta chose a steel body with a corrosion-resistant blued finish to provide shooters with the utmost durability.

The orange anti-tilt polymer follower and polymer base plate guarantee durability and reliability while reducing the magazine’s overall weight.

This magazine is compliant in states like California and New York with its 10-round capacity.