I have this springfield savage 20g shotgun that would have been a sears and robuck special in the mid 70s that was owned by my uncle,
my dad took it apart to make it into a wall-hanger for his parents and had to have a gunsmith put it back together for him and the gunsmith allegedly said something along the lines of
this gun is not servicable, you are not supposed to take it apart, it's a cheapo piece of shit and you probably shouldn't even shoot it now, probably.
I have been shooting it,
sometimes the lock sticks and also sometimes it tries to send two out of the tube at the same time causing a jam.