40-Series Represents the Perfect Balance of Performance, Durabilityand Value6061-T6 Aluminum CoverInnovative Clip-Seal Seals the Top Assembly and Captures theCompression RingInterlok Spacer CompatibleSealed Black Oxide Steel Cartridge BearingConsistent Stack Heights Across 10, 40 and 110-SeriesInternal Parts Are Cross-Compatible Across 10, 40 and 110-Series
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