Hi,
i’ve got some serveral problems with my Controller, i cant scope.
even though i cant find any decent informations about this so set a “key” for it in options, Valve games can scope with right mouse click or not? well, i’ve also tried playing with keyboard and mouse and cant scope there also. Any ideas? 
Currently, there are no weapons in any Valve games (and as a result, Black Mesa) that have an ironsight function bound to it’s own key. The Left 4 Dead games did have a dedicated scope function for scoped weapons, but this was due to the fact that all guns had the same secondary function; meleeing.
The only two weapons in Black Mesa with usable zooming sights/scopes are the .357 magnum and the crossbow, and both are activated with the key/button bound to secondary fire.
Valve games are more traditional-style, which means no ironsights. If the weapon has a mounted scope though, you can look through the scope using whichever key is bound to “alt fire”.
“Alt fire” enables the secondary function of the current weapon. On some weapons it’s a grenade launcher, on others it’s a scope, on others it’s a charge-up, etc.
In Black Mesa, the game follows the same rule, with the ONE exception of the .357 Magnum, which uses ironsights as a secondary “alt” function.