I'll do a little research to try and find out just to try and help you out. If I don't reply, I haven't found anything out. In that case, Sorry. But I suppose if you're that worried about it don't by the trapper. Plenty of other model 94s out there.
Where is the one your considering buying, if you have one in mind? At a local dealer or on the internet? Also, if it is on the net, put a link in your reply.
G-Meister
i don't think it was manufactured in 1991 with that serial #. i just bought a model 94AE just about a month ago and the serial # on it is also in the 6es. I'm guessing mine was somewhere near the last run. That one also. The website where you can check the serial # and get a date stops only covers from 1-5103249. Have no clue why if they go beyond that #.
If you want to check that site out, maybe find info about your post here is the link to it.
Winchester Manufacture Dates
Main page is here though.
ArmsCollectors.com Main Page
GlockMeister