If you want to get it working I service them, drop me a message.
I'm not amazingly familiar with the very early Eclipse cockers, earliest I have is a 97, but from the parts I can see, £2-250 to the UK collector. Pity the frame is cut but that is period correct.
From this era you did not always get an ASA or barrel with the marker, you would more often use a bolt on air system like something very heavy from Air America or a stock and remote air or even C02 still
There where lots of aftermarket parts so it's pretty normal for original parts to be swapped out over the years and as above markers did not always come as a complete package, no barrel, ASA, HPR was perfectly normal.
Needs a rebuild, regs set up and timing 150-200
As above, I do service them but I hear you may have had it looked at by another good tech recently