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Old February 19, 2013, 02:02 AM   #2
AR15barrels
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Join Date: August 23, 2006
Location: Los Angeles, CA
Posts: 53
Bushmaster carbon 15

There are a couple different generations of the carbon 15.
Some accept standard ar-15 barrel nuts.
Others have larger threads and will need the barrel nut on the new handguard to be enlarged before you can install them.

Measure the major diameter of your receivers threads and I'll tell you which you have.
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