The Remington R51 is a modernized semi-automatic pistol based on the original John Pedersen-designed Remington Model 51, reintroduced in 2014. Chambered in 9×19mm (9mm Luger), the R51 utilizes a unique hesitation-locked action, which distinguishes it from other pistols in its class. This system, developed by Pedersen, involves a locking breech block within the slide, allowing the pistol to handle higher-pressure cartridges, including 9mm +P rounds. The recoil spring is positioned around the stationary barrel, reducing the overall profile and enhancing accuracy by minimizing muzzle rise. The low bore axis further reduces perceived recoil, making the R51 comfortable to shoot while maintaining a compact and sleek design. The R51 features an internal hammer with a built-in drop safety, a single-action trigger, and a primary grip safety that must be engaged for the pistol to fire. The frame is machined from 7075 aluminum alloy and is available in matte black or smoke gray anodized finishes, while the slide is crafted from stainless steel with a matte black FNC finish. The 3.4" barrel is made from 416 stainless steel. The ambidextrous magazine release allows easy operation, and the single-column steel magazine has a 7-round capacity. The R51's ergonomic design includes a 20-degree grip angle, checkering on the front strap, and polymer grip panels, with optional rubber and rosewood grips available. The R51's blend of modern engineering and classic design makes it a versatile and reliable choice for those seeking a compact 9mm pistol.