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Posted: 12/30/2006 11:13:55 PM EDT
I know there is a heavier buffer for 9mm carbines. but is the buffer spring the same standard 5.56mm spring?
Link Posted: 12/30/2006 11:44:38 PM EDT
The carbine buffer spring is the same, 9mm or 5.56mm.  However, some springs are wound with the coils a slightly smaller diameter than is needed for the 9mm buffer.  If the spring won't slip onto the buffer, with both out of the AR, you'll need a spring with larger diameter coils.

The DPMS buffer springs will work with the 9mm buffer.  There are others, but I don't know which ones.
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