I have two Lissner 1911 barrels.
Lissner is an Australian barrel maker and I believe he may have closed up shop as his number is disconnected???
I purchased a barrel from Tex Gun Supplies
at 67 Eaton Place Darwin, NT, 0812 if you are trying to find a source geographically they are located in the Victoria area.
I cannot find the receipt for the phone number but I did have the address in my Journada.
I have heard the Lee Brown in Bakersfield uses/has used the Lissner barrels.