Teslong Borescope
Following 358SCOTT's clue, I found that the top of the mirror does indeed stick out over the edge of the tube. I measured it at about 0.203". Most of the rest of the assembly measured around 0.196". I dressed the edge down with 400 grit and finished with 600 grit and the area now measures about the same as the lower portion. It will now go easily down the bores of both my Remington 591, 5mm Mag. barrels. Thanks Scott!
Bob
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