Original German Pre-WWII Brass Optical Tripod Mounting Coupler and Calibration Unit MG 42 Bolt & Barrel Assembly The bore is clear with

The bore is clear with good rifling

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Lend-Lease issue Thompsons were used by the British Army

We were hit by flak about three minutes before bombs away

Panzerjäger-Abteilung 28

Original German Pre-WWII Brass Optical Tripod Mounting Coupler and Calibration Unit MG 42 Bolt & Barrel Assembly The bore is clear withOriginal Item: Only One Available. So often these are missing, the interfacing unit allowing a "Rabbit Ears" pair of Binoculars Field Glasses to be mounted onto the standard German Optic's tripod. The early production example is constructed almost entirely of BRASS, which has been polished, and dates from the late pre war 1930's. Brass became a very scarce commodity once WWII started, so these couplers were then constructed from steel. Original