5.56mm Full Metal Jacket is a Doom 3 multiplayer total conversion which takes place in fictive environments all over the world in the year 2020 where the 2 remaining superpowers (West and East) send their best men to outplay the enemy and be first to dominate the area of operation. The special forces teams consisting of battlefront experienced marines, skilled engineers and expert scientists fight it out on a great variation of different maps which range from huge deserted outdoor complexes to the narrow spaced metallic stations of the 22nd century (time travel).
FMJ is one of the very few multiplayer online shooters that provides absolute precise calculated damage and ballistics calculations. Every bullet fired in FMJ is actually rendered as a single 3d bullet object that travels through the virtual space being affected by physical parameters such as gravity. Furthermore FMJ makes use of Doom3's introduced per-poly-hit-detection-system which is superior in any thinkable way compared to the system used in common 3d shooters (hitboxes). FMJ makes use of the "unified light and shadowing" concept to the fullest and renounces faking or skipping features.