The Ruger 57 is a semi-automatic pistol chambered in 5.7x28mm with a 20-round capacity. The turquoise finish is the defining visual trait here — it stands apart from the standard black polymer pistols that fill most shelves. 
 

Key Specifications 

• UPC: 736676164059 
• Action: Double Action 
• Barrel Length: 4.94 inches 
• Caliber: 5.7x28mm 
• Capacity: 20 rounds 
• Finish: Turquoise 
• Material: Polymer Frame 
   

Features 

 
The hardened billet steel slide has lightening cuts and comes drilled and tapped for an optics adapter plate (sold separately at ShopRuger.com). Sights are adjustable for both windage and elevation — serrated rear, fiber optic front — which helps with quick target acquisition. 
 
The alloy steel barrel has a black nitride finish for wear resistance. Ruger's Secure Action fire-control system uses an internal hammer to reduce the chance of accidental discharge. 
 

Usage 

 
The 20-round capacity is a genuine advantage for range sessions or home defense, cutting down on reloads. Recoil in 5.7x28mm is mild, which makes the pistol approachable for a range of shooters. The optics-ready slide and adjustable sights give competitive shooters room to dial in their setup.

Owners of the Ruger 57 Turquoise tend to respond well to it, with a few recurring practical concerns.

On the positive side, the turquoise finish attracts attention for being different in a market that defaults to black or dark gray. Accuracy and felt recoil get consistent praise — the 5.7x28mm round is soft-shooting, and the platform handles it without drama. The 20-round magazine capacity comes up often as a meaningful advantage over most handguns in similar categories. Reliability reports are generally good across varied conditions.

The recurring criticisms are practical rather than mechanical. 5.7mm ammunition is harder to find and more expensive than 9mm or .45 ACP, which limits how often some owners actually shoot it. The price point draws some comparison shopping against other calibers. Ergonomics split opinion — most find the grip comfortable, but a minority note it doesn't fit smaller hands well. Shooters coming from conventional DA/SA or striker-fired pistols may need a short adjustment period with this platform.