Proofhouse.com has sn tables for Winchester.
Return spring is sprung
Winchester had a lever shot gun with this mdl number, is that the gun you mean?
Best left to a gunsmith
Search on youtube for Winchester 1300 assembly, they are internally the same.
Best left to a trained gunsmith.
Yes, but ejector spring may need modification- slight change in slot for spring.
A number of rifles did not have serial numbers prior to 1968. but, that has changed.
when did spring make 12g single barrel shotgun serial number 30368
Remove the 2 screws from the end or the mag tube and the cap and spring will come out. Do so carefully as the spring is compressed
That is correct if the spring is upside down it will not lock back. The big end of the spring goes toward the cap.
You need to take it to a competent gunmsith
You need a good gunsmith.