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Prismatic Telescope Elbow. This is a sight alignment tool for muzzle boresighting. Boresighting is an alignment process whereby an optical sighting system (such as the telescope elbow), is referenced to the centerline axis of its associated gun tube. This accurate instrument is made for 50 cal guns with bore tube of 12.7 mm (or 0.5 inch). This is a mark 2 model with a registered number made in 1967 with excellent resolution - 10X telescope. |
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