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Old November 27, 2010, 01:01 PM   #6
Senior Member
Join Date: December 23, 2006
Location: Houston, TX USA
Posts: 384
sonrider657, I notice the Bushmaster listing for that upper includes this:
Uses modified Carbon 15 Barrel Extension Barrel Assemblies.
What does that mean for someone thinking about building an upper with one? Can you use a standard barrel, barrel nut and delta ring assembly?
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