The Ruger 5.7 is a polymer double stack pistol chambered in 5.7x28. This is one of the only other handguns chambered in this other than the FN57. The Ruger has steel magazines, a fiber optic green front sight, and an adjustable blacked out rear sight. It has a picatinny rail and an enlarged thumb safety. The slide has been lightened by a cut out close to the muzzle.