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Old 01-13-2014, 12:57 AM
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ar15barrels ar15barrels is offline
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Default 5.45 AR keyholing

Quote:
Originally Posted by Junkie View Post
As I said, it IS smaller bore than the 5.56 barrel, but I suppose it likely isn't small enough.

The groove diameter is what really matters more than the bore diameter.
Slugging the barrel will let you measure the groove diameter.
Your bullet test is measuring bore diameter...
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