I don't know about that new tippmann barrel.. however.. its really just a matter of sanding the inner gap... then try to slide the barrel inside.. if it fits then obviously your done.. if it doesn't... keep it up. I used this method, for obvious simplicity, but also to be very accurate.. You dont want to make the gap too large otherwise you run the risk of damaging your barrel, due to the wear and tear of the in-game.

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Benjamin Sheridan PGP2, CCI Phantom VSC, ACI Maverick, PMI Trracer, Tippmann X7, Alpha Black, Smart Parts SP-1, and PCS USP