The UMP45 uses free blowback rather than roller-delayed blowback as found on the MP5. To ensure accuracy, the UMP45 uses a closed bolt. A limiter is also installed, limiting the Rate of Fire to 580 RPM to increase controllability in full-auto and to decrease bullet spread. The cyclic rate of fire is increased to 700 RPM when high-pressure rounds (+P rounds) are used. The straight, plastic magazine holds 25 rounds, fewer than 30 rounds that the magazine of the MP5 is capable of holding due to the larger dimensions of the. Another 10-round short magazine is also available. The front end of the barrel is threaded to accept silencers or flash hiders. The stock folds to the right without blocking casing extraction, similar to the G36.Feed system: 25-round detachable magazine.Overall length: 695/455 mm(stock extended/folded).
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