The Crossman Phantom 2000 has a 3/8" dovetail rail on the reciever. If I'm not mistaken that UTG scope comes with Weaver/Picatinny mounts ( 7/8"). There are adapters available for pretty cheap if you have your heart set on that scope but you have to keep in mind that an air rifle has dual recoil. It recoils both forward and backward. Most standard rifle scopes are not designed to withstand this type of recoil and will most likely break after a few shots.
If your looking for a cheap air rifle scope I would look into NcStar. Most of their entire line are Airgun rated and hold up to dual recoil.
I have been using this one with good results:http://www.outdoorbunker.com/NCSTAR-3-9 ... -sfb3940r-