Remove the forend and and check for looseness when the action is closed, when open doesn't matter, if it's loose when locked up without the forend on, you don't want it unless you can get it real cheap. You can buy a brand new Pardner for not much more, in fact the local chain store has em on sale for $99.99 a few times a year, I wouldn't give more than $50-$60 for a used one myself.
Tim