For an added challenge, DIM can randomize your loadout, picking from your entire set of equippable items. Clicking "Randomize" will equip completely random weapons and armor. Clicking the "Weapons" sub-button will only equip random weapons.
If you search first (in the search bar), the Randomize button will change to "Randomize from Search", and it will only pick random items that match the search. Use this to, say, choose random items matching "is:sniperrifle".