I looked through the POF catalouge labeled Infantory_Weapons.pdf and I assume the gun in the catalog labeled .308 Win Sporter is the gun you have.
I don't think the barrel length will change the action function much if any although I'm no expert on that.
Changing the barrel length will change a few things with regards to the ballistics.
Muzzle velocity will probably change ~20-25 FPS/inch or 60-75 FPS overall.
Depending on how the barrel length is changed and how good the job is done there may be other concerns. One might assume the factory would know what they are doing and would recrown the muzzle correctly if they shortened the barrel or if they swap the barrel would reassemble the rifle correctly, that the front sight would still align correctly. However, modifications are not always done correctly even when the manufacturer is doing the modification. I have NO knowledge of POF's capability or reputation concerning such mods. Assuming there is no difference in the quality of the barrel before and after (regardless of how they go about it) there will still be some consequences.
Harmonics are likely to change -> favored loads might not be as accurate. You may need to reevaluate ammo for accuracy.
The change in velocity may reduce maximum effective range slightly. You may need to rework your range and drop tables. Especially true if your ammo choice changes.
The balance of the gun will change slightly so it may feel different.
My advice might be IF it isn't broken why 'fix' it and risk it becoming less than it is now?