All USO scopes I've used were CA made. Kalispell is where they went after they sold it. My buddy over there said he didn't recommend any scope they made while in Kalispell. Then ZRO bought them and they moved to NC; he left while in MT. I received an email from them this AM that said they have retained several original Brea staff and the Foundation glass is Japanese and Euro, which is good.My USO was ordered directly from them back when they were in CA. You used to get a 10% mil discount.
I generally stay away from sub-$500 scopes. Only exception is Leupold, even when they use chicom glass, and they do on their cheap scopes, everything that counts (the metal) is made at their facility and they have that down. I will use anything MIJ though.