FX Crown Mk II .25 - I bought a Huma transfer port...

Be advised, the Crown mk2 should come stock with a dual transfer port. A single hole pellet side, and dual port slug side. I don’t know if the Huma version offers much advantage.
I am fully aware, unfortunately due to bad machining from the factory it will not seat properly when i try to place the barrel housing assembly in the 6 o'clock position (where the dual hole transfer port is) , it jams up and it feels like its slightly grinding metal on metal. but when i flip it around to use the pellet transfer port it slides right in, perfectly. every time.
 
I almost forgot to tell you that I ordered new 600mm 25cal Crown Barrel from Utah Airguns and it came with the old, single sided pellet port. So, I ordered a Huma transfer port and installed it myself. I ran into the same issue you are having and had to use my Dremel and polish it down to make it fit. It took a little while (about 2 hours) but it's a perfect fit now.
 
Could you possibly take a picture for me?
This one may be too far down.

Polish_20220809_155530296.jpg
 
I am fully aware, unfortunately due to bad machining from the factory it will not seat properly when i try to place the barrel housing assembly in the 6 o'clock position (where the dual hole transfer port is) , it jams up and it feels like its slightly grinding metal on metal. but when i flip it around to use the pellet transfer port it slides right in, perfectly. every time.

If you held your barrel with a vice/pliers on the end, you most probably have small marks left by the vice/pliers where it griped.

These marks can be tiny pieces of metal that protrude causing the grinding sound.
 
I am fully aware, unfortunately due to bad machining from the factory it will not seat properly when i try to place the barrel housing assembly in the 6 o'clock position (where the dual hole transfer port is) , it jams up and it feels like its slightly grinding metal on metal. but when i flip it around to use the pellet transfer port it slides right in, perfectly. every time.
Warranty time, if there is some left. Just call FX USA.

Patrick
 
I am fully aware, unfortunately due to bad machining from the factory it will not seat properly when i try to place the barrel housing assembly in the 6 o'clock position (where the dual hole transfer port is) , it jams up and it feels like its slightly grinding metal on metal. but when i flip it around to use the pellet transfer port it slides right in, perfectly. every time.
I would contact FX and ask for a replacement under warranty. They are pretty good about stuff like this.