Looking to change the open sights to a "better" more fine type.Are they available? Or will say sights from a model 700 or 760 fit? Trying to set the gun up for my son who demands to shoot open sights. I have several rifles all with scopes that he shoots real well with but i think following me around in the brush were i deer hunt he's having a hard time with the scopes. The factory sights on the 788 are not the most refined and i'm just looking to find a better set to give him a fighting chance at his first deer this coming season. thanks Gary