I have been following this thread with interest as I recently became aware of the Superstar. As luck would have it I found one in a second hand shop and picked it up this morning. I am pretty sure it has a gas ram but will need to investigate. First impressions are it is really easy to cock and very smooth to shoot.
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What a cracking find. I think it looks like a Theoben one with that long series mod/weight. Does it have a valve bit on the end block or sumin?
I had mine out this morning for a little plink. Decided to remove the irons and swivels for now as not using them.