Released in November 2014 via the Operation Vanguard Weapon Case, the M4A1-S | Basilisk sits at the Restricted tier within The Vanguard Collection.

The float range for this finish is restricted to 0.00–0.68, 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 | Basilisk are tracked across 18 marketplaces, with prices spanning $7.41 to $88.82 depending on wear, variant, and seller.