Equip your Space Marines with MkIV Maximus pattern power armour in a new box of 20 Tactical Marines. This reimagining of the classic armour contains enough parts to build two Sergeants, so you can run the squad as two units of 10 or a single unit of 20, and is compatible with all previous weapon upgrade sets. It even comes with a set of vambrace parts for every Space Marine, so you can make the arms included in several of the upgrade sets look more like the classic MkIV design.
