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This Magnum Research MLR .22WMR / 22 Winchester Magnum Rimfire rifle is equipped with the Magnum Lite revolutionary patented graphite barrel exclusive to Magnum Research or a stainless steel barrel. The patented uni-directional graphite fibers in the MRI graphite barrel are parallel to the bore axis; and results in a barrel with 6x the stiffness of the equivalent weight of steel. The lighter barrel weights (from 13-16 oz depending on barrel length) are easier to wield and dissipate heat up to 43% faster than steel. The result is rim fire performance of extreme accuracy.