Access Filter Listbox

Hi. I have an Access ListBox with the following RowSource. I want 5to filter by specific  ArmPK on opening the form. Do I reset the Row Source or is there a better way to do this?

SELECT t_Arms.ArmPK, t_Arms.ArmType, t_Arms.ActionType, t_Arms.Manufacturer, t_Arms.Calibre1, t_Arms.SerialNo, t_Arms.SerialNo2
FROM t_Arms
WHERE (((t_Arms.ArmType) Like "*" & [forms]![f_List_Arm]![txtSearchArm].[Text] & "*")) OR (((t_Arms.ActionType) Like "*" & [forms]![f_List_Arm]![txtSearchArm].[Text] & "*")) OR (((t_Arms.Manufacturer) Like "*" & [forms]![f_List_Arm]![txtSearchArm].[Text] & "*")) OR (((t_Arms.Calibre1) Like "*" & [forms]![f_List_Arm]![txtSearchArm].[Text] & "*")) OR (((t_Arms.SerialNo) Like "*" & [forms]![f_List_Arm]![txtSearchArm].[Text] & "*")) OR (((t_Arms.SerialNo2) Like "*" & [forms]![f_List_Arm]![txtSearchArm].[Text] & "*"))
ORDER BY t_Arms.ArmType, t_Arms.ActionType;