The MR762 A4 SBR represents the peak of that evolution, offering unmatched capability and rugged durability. You can simply run this rifle harder and longer without sacrificing accuracy or reliability. The entire design has been reinforced and enhanced. Its short stroke gas piston system does not push hot carbon fouling back into the action, allowing the weapon to operate longer, with less maintenance and less wear on internal parts. Its adjustable gas regulator lets the operator fine-tune the action for either suppressed or unsuppressed use. The MR762 A4 SBR is the ultimate choice for those who prioritize performance and dependability above all else.