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4/4/2008 5:20:33 PM EDT
What purpose do the T numbers serve on the flat top uppers? Are they etched , painted ???????????? Do we need them?

Edwin
4/4/2008 7:56:41 PM EDT
[#1]
If you are swapping optics back and forth then it makes it easier to be sure that you're always isntalling them in the same place.
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