The Kel-Tec PR57 is a semi-automatic pistol chambered in 5.7x28mm with a 4.64-inch barrel and 20-round capacity. It uses a top-loading, stripper-clip-fed magazine system, which differs from the conventional detachable box magazine found on most pistols. The slide and frame are finished in black, and the pistol has an optic-ready cut on the slide. 
 

Key Specifications 

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

Detailed Features 

• 5.7x28mm chambering 
• Top-loading, stripper-clip-fed magazine system 
• Optic-ready cut on the slide 
• 4.64-inch barrel 
• Black finish on frame and slide

The PR57 attracts owners who specifically want the 5.7x28mm cartridge in a pistol format, and the top-loading stripper-clip magazine system is the feature that most divides them. Proponents see it as a clever, compact solution to feeding a rifle-derived cartridge in a handgun; critics find the loading process slower and less intuitive than conventional box magazines, and reloading under any kind of pressure is a common complaint.

The 20-round capacity is a consistent positive, and owners who accept the loading system's limitations tend to appreciate having that many rounds available without a bulky extended magazine. The optic-ready cut is well-received and described as a practical inclusion for a pistol intended for competition or home defense roles.

Build quality perception splits predictably along Kel-Tec's general reputation. Some owners are entirely satisfied with the molded construction and fit at the price point; others prefer more machined components and cite the feel as a reason they would not rely on it as a primary defensive firearm. Reliability with quality 5.7x28mm ammunition is generally reported as good, though picky ammunition feeding is noted occasionally in owner feedback.

Very light with an easy loading system, but the stripper clip's thumb tab comes loose too readily.