The Kel-Tec PR57 is a forward-thinking, striker-fired pistol built around the 5.7x28mm cartridge. Instead of relying on a conventional magazine, it features an integrated ammo storage system that keeps the design slim, modern, and impressively compact—all while delivering a 20+1 capacity. Its green polymer frame paired with a black slide gives it a bold, durable look. Optics-ready and engineered for dependable performance, the PR57 is made to run smooth when the pressure is on.