Rival Arms Extended Slide Lock fits Glock 43, 43x, 48 Black QPQ Case Hardened Stainless Steel Field strip your pistol quickly and easily with stainless steel slide lock (take down lock) that is easier to grip and wont chip, wear or break. CNC-machined from a solid stainless steel billet for a stronger more precision part. Quench-Polish-Quench (QPQ) thermo-chemical case hardened to resist normal wear and tear even in the harshest conditions.