NO! NO! NO!
don't shoot anything out of that gun until you replace the main spring and the buffers.
if you fail to head this warning you will crack the bolt slide and you cannot find a replacement.
its a bit late now ,but I would pull the slide and inspect it before I made any other move with this gun.
now if the slide is uncracked
you can get replacement a mainspring and the receiver buffer and bolt buffer from diamondgunsmithing.com.
les is an X head gunsmith for Ithaca ,he has new ,improved parts that will cost about $50.
replacing the parts is not hard ,in fact ,no tools are needed to break the gun down
all the above said if you replace the mentioned parts you will have a marvelous shooting gun.
they have an extremely light recoil even when using high brass shells
they are great pheasant guns
Da hawk ate my baby!!