[New shotgun or new barrell?]

Hi all, I bought my first shotgun last year, an M2 tactical, for home defense. I want to now go skeet shooting but I believe my gun is not ideal, especially because my barrel is too short.

 

Question 1: Do you recommend I buy another shotgun - a Benelli, of course. Or, should I buy another barrel?

 

Question 2: If I do get another barrel, which one do you recommend?

 

Question 3: How hard is it to replace barrels on a Benelli?

 

Thanks!

Sam