If you don't want the Tek Rifle+ to damage structures then set TekRifleNoStructDmg to true but you will have to remove the original Tek Rifle engram from your server, which may need a wipe if players have the original Tek Rifle engram.

GameUserSettings.ini
[WeaponPlus]
TekRifleNoStructDmg=true

Game.ini
[/script/shootergame.shootergamemode]
OverrideNamedEngramEntries=(EngramClassName="EngramEntry_TekRifle_C",EngramHidden=true)