Carbon fiber barrel sleeve OD

I posted this on another page and didn't get a response so I thought more folks might look at this page.
I am new to air guns. I have a FX impact M3 30 cal with a 700mm barrel. I ordered a 30 cal 700mm carbon fiber sleeve. Installing it was easy until I tried to insert it into the barrel. It will not fit. I have watched several videos and it just slides in. The sleeve OD is almost the same as the barrel OD. I think I measured the ID of the barrel on the threads at .459 and the OD on the sleeve at .464. Has anyone had this issue.
 
Hi Varmintsshooter,

If you still have not found a solution by Monday, please call one of our technicians. If there are still difficulties from there, they will transfer you to our customer service department and see what other steps we can take to find a solution.

Regards,
FX Airguns USA

Contact
Monday - Thursday 9 AM - 4 PM EST
Fridays 9 AM - 3 PM EST
Phone: +1 866 639 0772
[email protected]
 
Hi Varmintsshooter,

If you still have not found a solution by Monday, please call one of our technicians. If there are still difficulties from there, they will transfer you to our customer service department and see what other steps we can take to find a solution.

Regards,
FX Airguns USA

Contact
Monday - Thursday 9 AM - 4 PM EST
Fridays 9 AM - 3 PM EST
Phone: +1 866 639 0772
[email protected]
FX thank you, I will call.