This is the factory OEM Beretta APX .40 S&W 18 round extended magazine.

If you’re looking for extra capacity with factory reliability, this is the magazine for you. Featuring a blued steel body with Beretta internal components, this 18-round magazine is built for durability and reliability.

The extended polymer magazine extension adds 3 rounds and allows for easy extraction. Last, the rear-facing witness holes allow for quick and easy round checks.