The H&K UMP, designed as a more economical alternative to the MP5, utilizes a simple blowback action with a closed-bolt, hammer-fired operation. It features a polymer receiver and is available in .45 ACP, .40 S&W, and 9mm Parabellum, with a unique anti-bounce mechanism in the bolt. Its slower rate of fire enhances controllability, making it suitable for law enforcement applications.
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