I have a Zermatt origin now, and I would like to build a TL3 to try AW mags but be able to use some of my origin barrels on the TL3. Ray at Zermatt said PVA used to make a ring to move the barrel out .100 so u could do this, since the origin tenon is .100 longer. I was wondering if anyone knew of anyone that currently makes one. I talked to PVA and they said they don't make them any more.