FX Impact M3 advice needed

New to this exciting sport. Just recieved my new M3 .25 sniper. Have a CF sleeve arriving today. Have not shot or done anything to my gun yet. Have read on this forum and watched videos about cleaning the barrel first as it may have a coating in the barrel from shipping from overseas. Since i will be removing the barrel anyway to install the CF sleeve should i slide a pellet down the barrel after cleaning to check for any tight spots? Watched videos where this has been a problem and a polishing was needed to cure this. 

Your thoughts?
 
I agree with clean it and shoot it.

Virtually every new barrel I touch will get worked with a light abrasive but it’s always a good idea to test it in its original form to establish a baseline. So for example, if the barrel turned out to be a real stinker, a polishing regimen is not going to be a magic cure. Something like a bad crown or leade or an irregular bore is another matter entirely.