We herein report a case of a 22-year-old male with intraocular foreign body (IOFB) due to catastrophic gun malfunction. Cases of ocular trauma with IOFB are very common in ophthalmic daily practice. However, military associated eyeball rupture with IOFB are rarely seen in Taiwan. Features of this case are discussed together with its implications, including the incidence rate, management and prognosis of IOFB.