I have a new 204 ruger upper complete assembly. Unfired, it has a 24" heavy barrel (not bull) chrome moly with flash hider. I believe it is a stag or rra. the only markings visible on the upper is a cardinals head. 1-12 twist. Free float aluminum tube. I took it in trade and it has been a safe queen. $625.00 tyd.
Update on Make, The only markings on the upper are: ruger 204 1-12 twist on the barrel. the cardinal forge marking on the receiver. The manufactures that use the upper are RRA, Stag, DSA. I was told it could be a Cmmg, but they use another upper.