When the US Special Operations Command put out a request for a Personal Defense Weapon (PDW) to replace the MP5, Sig Sauer responded with the MCX Rattler, an absolutely groundbreaking short barrel rifle. The Rattler is based on Sig Sauer's flagship MCX modular rifle, featuring its short-stroke recoil gas piston operating system. What separates Sig Sauer's MCX platform from other AR/M4 style rifles is the recoil system that totally eliminates the need for a buffertube, making the MCX Rattler more compact than any AR/M4 rifle ever produced.
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