Same here. I'm in the process of trying to get another AR together and want a dissy. Can't find one anywhere. Just keep an eye on the sites that normally have them and hope they get one in.
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.I know what an upper is but what's dissipator upper?