You're right on the scope I was thinking 40mm. The one you have is about $150 plus rings and all that. Even with the FFL fee that's only $15 plus free shipping and no tax. Someone was selling them local a little while back for $389. Either way it's a nice little setup for sure.
Like stated above, that a nice set up but $600 is kind of steap for it. The gun can be had for under $400 out the door pretty easily and the scopes on sale for $99 right now on cabelas. Is the scope a first gen or second? That will make a little difference too