Originally Posted by greenriver
I know what an upper is but what's dissipator upper?
its a 16" barrel using a rifle length gas system. it was the early first attemmpt at fixing the carbine length issues on a 16" barrel. it got swamped by the midlength gas systems which works better than carbine or rifle on 16" barrels.
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Last edited by JonM; 01-09-2013 at 02:22 AM.