I did some research, tried to find a legitimate thunder gun, but besides some extremely used ones, I couldn't find any. The street legal version is cute and all, but my 2135TiMAX puts out more power than the Street Legal Thunder Gun, so I went with what was really important. The power. If you have money, the MG725 is supposed to be a great gun also, I love my TiMAX, I crank my compressor past the 90PSI it is rated for and it loves it. Have not had an issue yet.