M4A1-S | Guardian by J4CK appeared in CS:GO on December 18, 2013. The skin belongs to The Winter Offensive Collection that was added to the shooter in the same-named update.

The rifle has a simple design: its forend, receiver, magazine, and shoulder stock are covered with dark blue paint. The CTs’ logo is applied to the magazine, and technical data such as the manufacturer's address and the weapon's serial number are indicated on the silencer.

Float Value of M4A1-S | Guardian can vary between 0.00 and 0.50, allowing the skin to be obtainable in any exterior quality category. As the weapon’s condition deteriorates, it darkens and loses paint along the edges. At high float values, the paint gets erased from all ribs of the forend, but the writings on the silencer remain intact.

M4A1-S | Guardian belongs to the “Classified” rarity grade and is available with the StatTrak kill counter. The skin is not popular among CS2 players.