Pro Mag Industries Magazine for Glock 28 Features The ProMag Magazine for Glock 28 is built around a magazine body constructed from a proprietary DuPont Zytel based polymer chosen for its strength and resistance to wear under repeated loading and firing cycles. A full-length steel internal insert is stamped and welded into the body in the same manner as a factory magazine reinforcing the structure where it matters most for long-term durability. This steel insert helps the polymer body maintain its shape and function even after extended use reducing the risk of feed lip deformation over time. An injection molded magazine follower is engineered to work smoothly with the body and spring for consistent round presentation. Powering the follower is a spring made from heat-treated chrome silicon wire a material chosen for its fatigue resistance so the spring retains its tension through repeated loading cycles rather than weakening prematurely. Finished in Black polymer and holding 17 rounds of .380 ACP the magazine gives Glock 28 owners extended capacity over factory options. Manufactured in the USA ProMag applies the same attention to materials and construction across its magazine lineup that shooters have come to expect from the brand. For Glock 28 owners who need a reliable extra magazine or a replacement the ProMag Magazine for Glock 28 offers solid construction at a reasonable price. Pro Mag Industries Magazine for Glock 28 Specifications Manufacturer: Pro Mag Industries Model: Magazine for Glock 28 Caliber: .380 ACP Capacity: 17 Rounds Compatible Hosts: Glock 28 Color: Black Material: Polymer Made In: USA Available At: GrabAGun