$175 is still a great price for a used one in good shape.
If you can get it for less, even better.
Just do yourself a huge one, and ask if they mind if you remove the bolt and check that and the barrel out.
If it is in good shape, it is likely that the barrel is too, but you want to make sure there is no rust or pitting anywhere.
If all is good, why buy a new one ?
Ranger