The Check-Mate 1911 .45 ACP 8-Round Hybrid Magazine with Removable Base is an ultrareliable 1911 pistol magazine, designed around a precision-machined hybrid steel body and welded base plate, engineered to deliver exceptional durability and lasting corrosion resistance for reliable performance in any environment. The stainless steel Check-Mate follower and the durable steel music spring offer smooth, reliable operation, while factory-drilled witness holes offer visual round counts at a glance. Better yet, this magazine is equipped with hybrid steel (stainless steel/high carbon steel) feed lips for improved durability and a tight lockup for enhanced feeding performance. Manufacturer’s lifetime warranty.