stock fm_get_weapon_silen(index)
{
       new silencemode = get_pdata_int(index, 74, 4), weapon = get_pdata_int(index, 43, 4);
       if (weapon == CSW_USP && silencemode & (1<<0)) return 1;
       if (weapon == CSW_M4A1 && silencemode & (1<<2)) return 1;
       return 0;
}

static weap_id
weap_id = get_user_weapon(attacker)

if (weap_id == CSW_USP || weap_id == CSW_M4A1)
{
       if (fm_get_weapon_silen(attacker))
       {
              damage *= 1.1
              client_print(attacker, print_chat, "增加伤害")
              SetHamParamFloat(4, damage)
       }
}