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Discussion Starter #1
If I had a perfectly zeroed Trijicon on a 5.56 XCR and swapped in a 7.62x39 kit, the BDC would be inaccurate but how far off zero might it be? Would I have to re-zero? LaRue mount.
 

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until the x39 kits are out there, your guess is as good as ours ;)

the guys with the 6.8 kits might be able to give you an idea though.
 

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You'll have to rezero, and I doubt the BDC is going to be even quasi-accurate. Big velocity difference between 5.56 and 7.62x39. 6.8 or 6.5 would probably be a little closer.
 

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I would go directly to Trijicon to ask that question. If different, they may already have a fix. :2cents:
 
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