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Level 1: These are fairly easy to take down. All thats needed is a grenade or 2 and a few shotgun shots. If you are soldier just fire 2 or 3 rockets at it and its destroyed. For demoman just keep launching pipes at it.
Level 2: Make sure you know the location of the gun. Hide behind a wall and keep popping out every second or 2 and throw grenades at it. If you are a lighter class you will need 2 grenades at least. For soldier you can throw a nail grenade at it. For demoman you can use secondary grenade and pipe bombs.
Level 3: The soldier is the best class for taking down one of these. All you need to do is hide behind a wall and prime a nail grenade. Pop out in front of it for a split second so you can get the grenade in front of it. Go back behind wall. Wait for grenade to explode. Nail grenades are the most effective in taking down an SG and all you should need is one. If you are of a lighter class it is very diffucult taking down a level 3 SG. If you are demoman you can throw 2 secondary grenades at it and some pipe bombs which should destroy it.