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BK7 glass , provide optical access to the slot orifice The windows are positioned in the center of three of the test section walls Two of the windows

I know some out there have Becker knives, some more then a few lol Which is better as a good field knife the BK7 or the BK9  Oh this thread again, lol Yeah basically some do some don't and the sheath always has a slot for it The Bk10 is far from being reproduced

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