I think in the AG pic above the emitter is painted a gunmetal grey to match a weathered, but not black, Derwent balance pipe, while the lower grip section beneath the clamp is actually painted black to match an oxidized booster. That said, the emitter looks to be black, and not just dark gray in ROTJ. Who knows...? Also, the brass color of the windvane area is very dark in the AG pic above.