The Ultimax Mark II, designed by Jim Sullivan, features a revolutionary 'constant recoil' system that significantly reduces felt recoil and muzzle climb, allowing for exceptional stability during full-auto fire. While its proprietary 100-round drum is effective, adaptations for STANAG magazines proved problematic due to wobble and reliability issues. The Mark II's fixed barrel could overheat, a flaw addressed in the Mark III's quick-change barrel system.
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