The M4A1-S | Nitro is a Restricted rifle skin from The Safehouse Collection, distributed through the DreamHack 2013 Souvenir Package.

The float range for this finish is restricted to 0.06–0.80, so Factory New, Minimal Wear, Field-Tested, Well-Worn, and Battle-Scarred are the only obtainable conditions on the open market. The restricted range is set by Valve at the time of release.

A Souvenir version is available, dropped exclusively from cases collected during Major Championship matches and stamped with that tournament's stickers. Active listings for M4A1-S | Nitro are tracked across 18 marketplaces, with prices spanning $0.36 to $100,000 depending on wear, variant, and seller.