The Ruger 57 is a semi-automatic handgun chambered in 5.7x28mm, a cartridge originally developed for the FN P90. This particular variant ships new in box with a black and gold Cerakote finish that's distinctive in a market where most pistols come in flat black. 
 

Key Specifications 

• Manufacturer: Ruger 
• Model: 57 
• Action: Semi-Automatic 
• Caliber: 5.7 x 28mm 
• Barrel Length: 4.94 inches 
• Capacity: 20 rounds 
• Finish: Black / Gold Cerakote 
• Frame Material: Polymer 
• Condition: New in Box 
• Safety Features: Ambidextrous safety 
• Sights: Fiber optic front & adjustable rear sights 
   

Features 

The polymer frame keeps weight down while the 20-round magazine means fewer reloads during range sessions. Fiber optic front and adjustable rear sights work well across different lighting conditions. The ambidextrous safety is a straightforward addition that makes the gun accessible to left-handed shooters without modification. Textured grips provide a reliable hold during rapid fire. 
 
The 5.7x28mm cartridge has notably low recoil for its velocity, which makes the gun easy to shoot quickly and accurately. Ammunition is more expensive and less widely stocked than 9mm, so that's a real consideration for anyone buying this as a primary range gun.

The Ruger 57 gets generally positive feedback, with most of the discussion centered on the 5.7x28mm cartridge as much as the gun itself. The 20-round capacity and low recoil get consistent praise, and the ergonomics land well for most shooters.

The predictable friction points: 5.7x28mm ammunition costs more than 9mm and isn't always easy to find at local shops. A few users have reservations about trigger feel compared to their preferred pistols, and sight preferences vary. But these are minority complaints in an otherwise favorable response. Most owners seem happy with the black and gold Cerakote finish, though it is a polarizing aesthetic.