A-rob and Aggie are right, Do it the easy way and use a heat gun (not a hair dryer) on the receiver to expand the opening. I've done this on a few hard to fit 10/22 receivers from Ruger and PWS. Works both for barrel installation and removal. You can also put the barrel in the freezer for a few hours, but the heat gun method has been 100%. Put a little anti-seize on the barrel tenon during install.
Reference PWS's manual for barrel install, page 19
https://manualzz.com/doc/6763862/t3-summit-user-manual---shade-mountain-armory
Don't sand parts to fit, the tenon is the critical mating surface area between the two parts! If the barrel is loose then the scope/rail/receiver POA won't be consistent with where the barrel is aiming and it will not be consistent. This is another example why I no longer buy used items of unknown history.