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.

A StatTrak™ version is available, which tracks confirmed kills made while the skin is equipped and typically commands a premium over the standard finish. Active listings for M4A1-S | Atomic Alloy are tracked across 17 marketplaces, with prices spanning $28.61 to $317.57 depending on wear, variant, and seller.