M4A4 | Radiation Hazard is a Mil-Spec-tier rifle finish, part of The Nuke Collection and dropped from the ESL One Cologne 2014 Nuke 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 M4A4 | Radiation Hazard are tracked across 17 marketplaces, with prices spanning $28.35 to $2,879 depending on wear, variant, and seller.