[Randy More]

There's an include that provides you "OnPlayerShootPlayer" callback, you can get it from here.
After you have it installed (( Adding the pastebin to a .ini file, #include 'file name' ))
Make this Callback:

pawn Код:

public OnPlayerShootPlayer(Shooter,Target,Float:HealthLost,Float:ArmourLost)
{
  
    return 1;
}

And there you go:

pawn Код:

public OnPlayerShootPlayer(Shooter,Target,Float:HealthLost,Float:ArmourLost)
{
    if(GetPlayerWeapon(shooter) == 24)
    {
           new float: hp;
           GetPlayerHealth(target, hp);
           SetPlayerHealth(target, hp-70);
    } 
    return 1;
}

Enjoy.