The Ruger 57 5.7 x 28mm Pistol features a fiber-optic front sight, an adjustable rear sight and an alloy steel slide and barrel with an oxide finish. The pistol features a glass-filled nylon grip and Secure Action™ fire control.
Without a doubt in my mind, the 5.7x28mm cartridge is an excellent cartridge that offers some advantages. The 5.7 round case and bullet are reduced in size to create what some say is an improved performance to the 9x19mm. The round has a long and slim design with bottlenecked case and pointed bullet, as you can see in the above photo. It is almost 4 times longer than its diameter. This compares to the standard 9mm round which is about 1.5 times as long as wide. The 5.7x28mm round has its center of mass back towards the rear of the bullet than others.