The Kel-Tec PR57 is a compact-frame semi-automatic pistol chambered in 5.7x28mm with a 4.64-inch stainless steel rotary barrel. It has a 20+1 capacity, a top-loading magazine system, and an optic-ready cut. The finish is Tungsten Gray with a black optic-ready slide. 
 

Key Specifications 

• Brand: Kel-Tec 
• Model: PR57 
• Caliber: 5.7x28mm 
• Action: Semi Auto 
• Capacity: 20+1 
• Barrel Length: 4.64" 
• Color/Finish: Tungsten Gray 
   

Detailed Features 

• Compact frame with top-loading magazine design 
• Stainless steel rotary barrel 
• Optic-ready cut on slide 
• 20+1 round capacity in 5.7x28mm 
• Tungsten Gray exterior with black optic-ready components

Owners of the Kel-Tec PR57 are drawn to the top-loading magazine system, which is unlike anything else in the compact pistol segment. In 5.7x28mm the capacity is a clear selling point, and most owners note the gun runs the caliber reliably once they find ammo that works with it.

The rotary barrel is discussed favorably for felt recoil, with owners saying the 5.7 round is already mild and the barrel design keeps muzzle rise low. Ergonomics get more mixed feedback, the compact frame suits smaller hands well but shooters with larger grips sometimes find the controls awkward to reach.

The optic-ready cut is appreciated, though some owners mention the mounting options depend on the adapter used and quality varies. Build quality opinions on the PR57 are typical for the brand: some owners report smooth operation from round one, others go through a noticeable break-in period.