Assuming that the scope uses the general controls you would use 'z'. If 'z' doesn't work then check for any on screen hints as to the controls and the description of the game. If this doesn't help at all then I would recommend you message the owner of the game.
Chat with our AI personalities
Look it up on the roblox wiki. just search roblox wiki
I believe that Roblox's Creative director is Telamon or John Shedletsky. If you go on Roblox look for me, Doggi1234
You have to download roblox.Then go to the start menu of you computer.Click all programs and look for roblox.Then click roblox the roblox studio.
You may want to look in the Roblox forums or Wiki for help.
look this up on youtube- How To Get Free Chat On Roblox (2012)