All iconic weapons
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Gris-Gris

Ranged · Revolver · Tech · DR-12 Quasar

What it does

Each hit has a chance to upload a random quickhack to the enemy; stronger quickhacks have a lower chance.

Where it sits

Locked storeroom, using a key from an earlier gigGig: Treating Symptoms

What you need

Key from Treating Symptoms

Pick it up before

Keep the key from Treating Symptoms until The Damned

If you miss it

No known way back

Who it suits

Cool handgun build, Focus, Deadeye and Run 'N' Gun; add Technical Ability charge/Bolt perks · Netrunner

The route

Show the step by step (spoilers)

Two jobs. During Treating Symptoms at the Luxor spa, take the storage key. Later, during The Damned, that key opens the storage room inside Slider's base, and the weapon is in there.

Confirmed by published guides, not yet by Vaexil. Nobody here has walked this one in game, so take it as a strong lead rather than a promise. Cross-checked against CD PROJEKT RED patch notes, VULKK, and the Cyberpunk Wiki, for patch 2.31 with Phantom Liberty.