This is a factory Bersa Thunder 9 9mm 17 Round Magazine. Specially designed for the Bersa Thunder-9, this magazine boasts an impressive 17-round capacity. Constructed from blued steel, it offers both durability and a sleek look. Inside, the polymer follower features an anti-tilt design, ensuring smooth, reliable feeding and reducing the chances of misfeeds. The robust steel spring wire ensures consistent tension and flawless operation. This magazine is also equipped with witness holes on the side, allowing for quick and easy round count checks. The polymer baseplate adds to its overall durability. This Bersa Thunder 9 magazine is a perfect choice for those seeking enhanced capacity without compromising on quality.