This gundam paper model is a SD GAT-01 Strike Dagger, a mass-production general-purpose mobile suit, first featured in the anime series Mobile Suit Gundam SEED, the papercraft is created by [unknown], and shared by yenc.
The GAT-01 Strike Dagger is the first mass-production general-purpose model mobile suit deployed by the Earth Alliance and is equipped with a Natural-use OS. It is developed based on the combat data of the G Project mobile suits, specifically the GAT-X105 Strike and also adopts the X100 series frame. The Strike Dagger is a greatly simplified version of the original GAT-01 design concept, which is later produced as the GAT-01A1 Dagger (aka 105 Dagger), due to an urgent need to produce large numbers of mobile suits in a short time. Compared to the original design, Strike Dagger omits the ability to use Striker Packs, has reduced weaponry as well as head-mounted antenna, and has an overall lower combat performance. Phase Shift armor is also removed as a cost-cutting measure, but this seems to be inherited from the original design and although this lowers the Strike Dagger's defensive capability, it however has the benefit of improving the MS's energy efficiency and combat endurance. The initial batches of Strike Dagger also did not have adequate EMP shielding, but this is rectified after the Battle of Panama.
As the Strike Dagger lacks the capability to perform in some specific environement, mainly aerial and aquatic, it often work in tandem with limited production mobile suits that are specalized for these areas, such as the GAT-333 Raider Full Spec and the GAT-X255 Forbidden Blue as well as support machines such as the F-7D Spearhead fighter jet. Though the Strike Dagger cannot fly, it can be equipped with a parachute so that it can be safely dropped from a carrier plane. Weapon wise, the Strike Dagger's armament is rather simple. It consists of a single head-mounted "Igelstellung" 75mm multi-barrel CIWS, a single ES01 beam saber for close combat, a M703 57mm beam rifle with an attached grenade launcher for ranged combat and a shield for defense. Despite not being as powerful as the prototype Gundam or the original design, the Strike Dagger proved to be a versatile and capable mobile suit that operate efficiently in a variety of environments on the ground or in space. [Souce: wikia]
You may download this papercraft model here: SD GAT-01 Strike Dagger Free Gundam Paper Model Download