This gundam papercraft is a RGM-79[G] GM Ground Type, a ground based predecessor to the RGM-79 GM, first appeared in Mobile Suit Gundam: The 08th MS Team, the paper model is created by [unknown], and shared by yenc.
The RGM-79(G) GM Ground Type was rushed through development during UC 0079 based on early data from Project V. This unit was intended as a test unit and to gather combat data alongside the space use RGM-79[E] GM Early Type. The RGM-79[G] used 80% of the same parts its more powerful cousin the RX-79[G] Gundam Ground Type. It also shared the durable Luna Titanium Alloy armor and its ability to use beam rifles and most of the Gundam Ground Type's weaponry. In one instance the head of a fallen GM Ground Type was used to replace the original head of a Gundam belonging to Karen Joshua of the 08th MS Team stationed in Southeast Asia.
One difference between the GM Ground Type and its Gundam brother is that the GM lacks both Vulcan guns and the chest mounted multi-launcher. [Source: wikia]
You may download this paper model template here: