The HK MR556 A4 features a short-stroke gas piston operating system that keeps hot carbon fouling out of the action, allowing for longer runtimes, reduced maintenance, and decreased wear on internal components. An adjustable gas regulator enables reliable tuning for suppressed or unsuppressed use. Fully ambidextrous controls, reduced weight, and a slimmer profile make the A4 faster and easier to operate while maintaining HK’s legendary durability and performance.
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