Don't shoot it if it's loose, have it checked by a good gunsmith. If the barrel is loose, it's unsafe to shoot.
Once tightened, the Head Space will need to be checked anyway.
I don't think that model has a barrel nut, but could be wrong. If it's loose on a pin, a larger diameter pin could be put in or some careful tig welding done depending on what it looks like to the Smith.
John K
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