In Fortnite Battle Royale, there are different classes of weapons such as SMG, AR, Shotguns, Sniper rifles, etc. I understand the difference between these classes of weapons, but I don't understand the differences of weapons within each class. For example there are normal SMG's and Tactical SMG's. What are the differences between these guns regarding strength, range and other statistics?
Other examples would be, SCAR vs Assault Rifle (AR), Tactical Shotgun vs Pump shotgun vs Heavy Shotgun.