This is the GAT-X103 Buster Gundam, its an artillery mobile suit. The weapons on it include a high-energy cannon, gun launcher, and missile pods. The Buster Gundam is heavily armored (Phase Shift) and is nearly impervious to melee attacks. This papercraft was designed and sent in by our Korean friends at cafe naver, even though I didn't understand your e-mail, thanks guys.
SD Buster Gundam Papercraft [via Mediafire]