How did you end up with 4? Thats like someone owning 4 ICE Epics. Did you know the manufacture personally?
If you can find the time to do it, please scan the manuals and upload them to vintagerex.com. Youd be doing anyone with another of these a great service as no one has any information about these things.
BTW I wouldnt loose any sleep with a short barrel instead of an LB.