The M4A4 | Mainframe debuted in CS2 on September 3, 2018. It was introduced with the Austin 2025 Nuke Souvenir Package, part of the "FACEIT 2018 – Ways to Watch" update.

The M4A4 | Mainframe can be acquired by opening one of the 10 containers featuring this skin. These include the Antwerp 2022 Nuke Souvenir Package, Austin 2025 Nuke Souvenir Package, and Berlin 2019 Nuke Souvenir Package. Additionally, the M4A4 | Mainframe is part of the 2018 Nuke Collection.

The M4A4 | Mainframe boasts a remarkable 90% popularity, making it one of the most sought-after skins in CS2. This popularity is determined by its daily sales and price trends.

The M4A4 | Mainframe is one of 304 Rifle skins available in the game. With its Industrial Grade rarity, the Mainframe skin is a commonly found item for players.

The M4A4 | Mainframe is an affordable skin, priced between $0.02 and $1.90. It is widely available and can be found on various marketplaces.

The M4A4 | Mainframe has a float value ranging from 0.00 to 0.50, making it accessible in all exteriors. Additionally, each exterior variant has a corresponding Souvenir version of the Mainframe.

The M4A4 | Mainframe features a striking "Anodized Multicolored" design, showcasing a multicolored candy coat. This style mimics real-world techniques like silk-screening and stencils. With a sleek black and gray color scheme, the appearance of the Mainframe finish is influenced by its pattern index. This skin utilizes the classic legacy model, making it a standout choice for collectors.