.50 cal Bore Viewer

These are a very nice find genuine WWII issue American brass bore viewer for the .50cal BMG.
Embossed on each one the maker " C Cowles & Co" Newhaven CT.
The mirrors are in superb condition crisp and clear no dents or dings to the brass bodies.
These are used by placing in the breech inserting the round end into the chamber and by looking into the viewer from above like a periscope you can inspect the barrel bore

Code: 50397