Rival Arms Slide Lock Extension For Glock Gen 3/4, Machined From a Solid Stainless Steel Billet, Quench-Polish-Quench (QPQ) Thermo-Chemical Case Hardened, Black Finish, No Gunsmith Required RA-RA80G001A High quality components and precise manufacturing make Rival Arms parts ideal for maintaining and upgrading firearms. The durability" reliability and excellent build quality of these parts will ensure years of service you can count on.