USP-S | Serum sits in the Arms Deal 2 Collection—one of the brighter Covert finishes on the silenced USP. Wear only rolls between 0.00 and 0.25 (Factory New through Minimal Wear). There is no Battle-Scarred tier, which is good news if you care about a clean slide and hate hunting penny-perfect floats.

Release

It landed with The Arms Deal 2 update on 8 November 2013, part of the early Arms Deal wave that still shapes how veterans picture classic pistol skins.

Designer

Valve in-house, not a Workshop submission—consistent “tech + electroplated metal” look from that era rather than a community lore piece.

Where it drops

• CS2 Case #2 (反恐精英 2 号武器箱)
• Arms Deal 2 Collection (direct collection item)

On C5GAME or Steam Community Market, filter the same collection and compare siblings—pricing Serum against its era makes it easier to spot overpriced listings.

What you’re buying visually

Valve’s blurb: chrome shell, digital graphics, metallic layers with different reflectivity. In hand that means big chrome hits on slide and body, blocky digits on top, and shifting highlights as you spin the inspect—more depth than a flat single-tone metal skin. The internal am_electric_red tag matches the warm electric-red read under map side light. Covert tier plus the 0.25 cap means wear mostly dims or hazes the finish; the layout stays readable instead of turning into grey mush.

Inspect checklist

1. In-game inspect first, then match float on C5GAME.
2. Digit placement on the slide—centered block reads sharper in screenshots and clutch moments.
3. Chrome zones—skip listings with scratch bands you’ll notice every round.
4. Low float: crisper digit edges.
5. Near 0.25: grip and barrel contact areas can look slightly softer—decide if that’s acceptable before you pay FN money.

Shopping conclusion

Worth it if you run pistols often and want a stable, bright legacy Collectible without BS float anxiety. Pass or downgrade wear if you need mirror chrome with zero scuff—this skin rewards picky inspect, not blind float sniping alone.

Editor’s notes

Serum has been a “first real USP flex” for old heads since 2013. It plays nice with cool-toned gloves—flashy but not shouting over your HUD. Treat it like jewelry: five minutes of inspect saves a regret buy.