Darren, My CVA Hawken rear site dove tail center is 7" from the end of the breech plug -
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The end of the rear sight is 5 3/8" from the plug....
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the placement for those of us with "old" eyes (Me!) this is a bit too close - it works ok just a bit blurry. Moving it farther out by .75 to an inch would help me. Everyone's eyes are a bit different so your mileage will vary!