[video=youtube]For crosshair ;
Go to (C:\Program Files (x86)\Steam\steamapps\common\Game Guru\Files\gamecore\guns\modern ) then select any weapon folder (for exm: colt 1911) After that delete (crosshair.dds) if you want to aim other guns with iron sight delete other crosshair.dds files too, it will make all crosshair disable in the GameGuru.
For iron sight ;
Go to (C:\Program Files (x86)\Steam\steamapps\common\Game Guru\Files\gamecore\guns\modern) then select any weapon folder, after that go in (gunspec.txt) Find (;//Model positions) and change the parameters like that.
simplezoommod = 2
simplezoomx = 0
simplezoomy = 1.5
Close the GameGuru and open again you should be using gun with iron sight and with no crosshair.
https://www.youtube.com/watch?v=s8TMQbexRM8