The MSN-06S Sinanju Stein (aka Sinanju Stein) is a mobile suit introduced in the PlayStation 3 video game Mobile Suit Gundam UC and UC-MSV.

The Sinanju Stein was developed as part of the Earth Federation Forces reorganization plan known as the "UC Project". Stein means "stone" in German and Norwegian, and the Sinanju Stein's name was a reference to it being "a jewel in the rough". This mobile suit was created by Anaheim Electronics to test the sensitivity and durability of the lightweight and rigid material, the Psycho-Frame, for use in a mobile suit's internal movable frame. The Sinanju Stein was also equipped with a Psycommu system, and the "Intention Automatic System", which functions by using the Psycho-Frame's sensitivity to the pilot's thought-waves to directly affect behavior of the mobile suit.

The suit boasts high mobility and features flexible thrusters on its legs and backpack, allowing it to achieve precise movements at high speeds. Due to its murderous acceleration, it was impossible for ordinary pilot to control the Sinanju Stein, and its evaluation tests were conducted on autopilot to test the limits of the Psycho Frame. Therefore, the Sinanju Stein can be said to be a defective machine for humans to pilot, but in reality, it was designed to be flown by Newtypes, as Anaheim Electronics was planning to hand it over to the Neo Zeon remnant group, the the Sleeves, in a backroom deal, in the form of a transfer disguised as a robbery.

Two lines of mobile suits were later developed using the Sinanju Stein as a base. These were the RX-0 Unicorn Gundam and the MSN-06S Sinanju. The Unicorn Gundam was thought to be developed by based on the data of the Sinanju Stein's test. The Sinanju was refurbished using one of two units stolen the Sleeves, and had its response levels tuned down as its controls were too sensitive. Due to how famous the Sinanju later became, the Sinanju Stein was also referred to as "The stone from which Full Frontal's Sinanju was hewn". The other stolen unit was also embellished with the engravings of the Sleeves and deployed in battle over RX-0 Unicorn Gundam 03 Phenex.

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