WTT: Looking for an Unported 31.5" Perazzi MT6 Type 4 Barrel

I'm looking for an unported 31.5" Perazzi MT6 Type 4 barrel that accepts chokes with threading near the knurled end.

I've got a ported 31.5" Perazzi MT6 Type 4 barrel that accepts chokes with threading near the knurled end.
I've also got a 28 3/8" Perazzi MT6 Type 4 barrel that accepts chokes with threading near the bottom of the chokes.
Both of the above barrels will fit any Type 4 Perazzi O/U, including MX8, MX12, MX2000, MX2000S, etc.