This gundam paper model is a SD GAT-X303 Aegis Gundam, a prototype transformable mobile weapon, it is featured in the anime series Mobile Suit Gundam SEED, the papercraft is created by [unknown]. The GAT-X303 Aegis Gundam is piloted by Athrun Zala.
Designated as the commander unit of the Alliance's G Project due to its enhanced communication and analysis capabilities, Aegis also has heavy attack power as well as Phase Shift armor and can transform into a mobile armor (MA) due to its X300-series frame. In MA mode, it has two different sub modes, 'cruise' and 'attack'. When in 'MA cruise mode', Aegis has higher speed and acceleration, while in 'MA attack mode', it can destroy enemy ship/mobile suit with its "Scylla" 580mm energy cannon directly or grab onto them with its four limbs first then destroy them using the cannon. Other weaponry used by the suit includes two head-mounted CIWS, a hand-held 60mm beam rifle, a shield and a beam saber in each limb.
Aegis also has a large sensor unit mounted at the top of its head and unlike most suits, its main thrusters seem to be mounted in the side binders, which is located at the waist. Due to the transformation system, Aegis's internal structure is more complex and it is for this reason that there are no mass production variants of the suit. The three different modes (MS mode, MA cruise mode and MA attack mode) also means that Aegis's pilot needs to have higher skills to be able to use the suit effectively. [Source: wikia]
You can download this papercraft template here: SD GAT-X303 Aegis Gundam Papercraft Free Template Download [Box] [Gavitex]