M4A4 | Mainframe

M4A4 | Mainframe is a Industrial Grade rifle skin from the Stockholm 2021 Nuke Souvenir Package. The “Mainframe” finish is applied to the M4A4. No key is required to open this container.

The M4A4 is the CT workhorse at $2,900, firing at 666 RPM but unable to one-tap through helmet. It's the most popular CT rifle in competitive play. The M4A4 Howl became the only Contraband-rarity skin in the game after a DMCA copyright takedown, with copies reaching $10,000+.

M4A4 | Mainframe has a float range of 0.00 to 0.50 and is available in 5 wear conditions. In CS2, the float value is permanent — set at drop time and unchangeable. It controls how scratched or clean a skin looks within its wear tier. Extreme floats carry significant premiums: 0.00x copies are prized for their clean look, while 0.999x Battle-Scarred copies like the iconic AWP Asiimov "Blackiimov" are collector's items. Some skins are float-capped and cannot exist in certain wear conditions.

This skin has a Souvenir variant. Souvenir skins drop from souvenir packages earned during Major tournaments and feature gold stickers from the event. They cannot have StatTrak and are generally rarer than standard versions.

As a Industrial Grade item, M4A4 | Mainframe has a 4.0000% chance per opening (1 in 25). Rarity in CS2 directly affects both supply and price. Higher-rarity skins drop less often, which keeps their market value elevated relative to common drops from the same case.

Prices shown are sourced from Steam Community Market and CSFloat, updated every 6 hours. Additional data from Skinport, Buff163, and YouPin. The Steam Community Market charges 15% total fees (5% Steam fee + 10% CS2 game fee), while third-party sites offer lower rates — CSFloat at 2%, Buff163 at 2.5%, and Skinport around 8% — with real-money cashout options. Beyond wear and float, the pattern index (seed 1–999) also affects price for certain finishes like Case Hardened and Fade, where specific patterns can multiply value many times over.