British Lewis LMG Tangent Sight Elevating Screw Knob
Original Item: The Lewis gun featured a folding leaf rear sight graduated to 2000 yards for the British caliber .303 Mk VII ball cartridge. The position of the slide in the sight leaf was adjusted by turning a knob attached to an elevating screw. IMA has a small supply of the elevating screw knob. They are dirty from long storage but clean up to the appearance of the knob in these photographs. RARE.
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