This Star Wars Advanced Combat Trooper is a very detailed custom minifigure and features a number of third party LEGO pieces.
The helmet is custom molded from 2 action figure helmets (tie fighter pilot and clone trooper) and incorporates a Tiny Tactical radio as an antenna, a warhammer piece on the helmet, and several Republic customs decals. The body armour is the BrickWarriors Gears of War RT Armour. The arms have Brickforge vambraces while the jetpack is an old Brick Affliction jump pack.
The body and legs have decals and then the whole minifigure is nicely painted with white, contrasting blues and silver detailing. Finally he carries a very nice minigun.