M4A1-S | Atomic Alloy is a Classified rifle skin from The Huntsman Collection, which entered the CS2 economy alongside the Huntsman Weapon Case in June 2014.

The float range for this finish is restricted to 0.00–0.90, 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.

Both StatTrak™ and Souvenir variants exist — the StatTrak™ counter tracks confirmed kills, while Souvenir copies drop only from cases collected during Major Championship matches. Active listings for M4A1-S | Atomic Alloy are tracked across 22 marketplaces, with prices spanning $21.46 to $249.52 depending on wear, variant, and seller.