The Kel-Tec KP50 is a semi-automatic pistol chambered in 5.7x28mm with a 9.6-inch barrel and a 50+1 round capacity using coupled 50-round magazines compatible with FN PS90 magazines. It has a polymer frame, a 1913 rear adapter, and ships in Black. 
 

Key Specifications 

• Brand: Kel-Tec 
• Model: KP50 
• Caliber: 5.7x28mm 
• Action: Semi Auto 
• Capacity: 50+1 
• Barrel Length: 9.6 inches 
• Color/Finish: Black 
   

Detailed Features 

• Uses coupled 50-round magazines compatible with FN PS90 magazines 
• 9.6-inch barrel in a pistol-legal configuration 
• 1913 rear adapter for accessory mounting 
• 5.7x28mm chambering accepts a wide range of available loadings 
• Polymer frame construction

The KP50 draws a specific crowd: owners who want a high-capacity 5.7x28mm platform in a pistol format. The 50+1 capacity using coupled PS90-compatible magazines is the defining feature, and most owners buy specifically for that. Range sessions with the KP50 are described as unusual and attention-getting.

The 9.6-inch barrel makes the pistol large and unwieldy by conventional handgun standards, and owners are clear-eyed about it not being a carry option. The 1913 rear adapter gets used by owners adding stocks or braces depending on their jurisdiction and configuration preferences.

Reliability with the PS90-compatible magazines gets mixed marks, with some owners reporting smooth feeding and others chasing intermittent issues depending on magazine condition. The Kel-Tec build quality is a common discussion point, with owners split between those who find it adequate and those who expected more polish.