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.