This video shows how I solved the problem of installing a Huma High Flow Dual Hole Transfer Port on my .35 FX Tensioned Slug Barrel.

The problem is that the shoulder inside the FX brass transfer port is situated 3mm deeper than the shoulder inside the Huma transfer port. By "shoulder" I mean where the breech end of the barrel liner stops inside the transfer port.

This causes the barrel liner retaining nut (liner lock) to stick out 3mm too far at the front of the barrel, which prevents the carbon fiber tube tensioning nut from seating properly against the carbon fiber tube to tighten it up.

My solution is to simply add one of the new Huma tensioning rings which comes in the Huma Kit shown below...the addition of this 3.5mm ring allows the carbon fiber tube tensioning nut to put the proper tension on the carbon fiber tube.

https://www.humaair.com/FXImpact.3...

All the best, Chuckster
You may contact me at: [email protected]