public OnPlayerStateChange(playerid, newstate, oldstate) // public
{
    if ((oldkeys KEY_FIRE) && (newkeys & KEY_CROUCH))
    {
        new weapon = GetPlayerWeapon(playerid);
        if(weapon == 24) // ID 24 = Deagle
        {
            ApplyAnimation(playerid,"GYMNASIUM","gym_tread_falloff",1.0,0,0,0,0,0);
            GameTextForPlayer(playerid, "~r~Stop c-bug !", 5000, 1); (gun)
        }
    }
    return 1; // return value
}