In 2007 Smart Parts released an updated version of the ion called the ION XE, that includes built in B.O.B (bolt out back) function, which allows easier removal of the bolt. This makes maintenance considerably easier, as one must only take out a single screw as opposed to taking apart the entire marker. This was one of the major criticisms of the original Ions. The new Ion XE also consists of a new and improved low profile feedneck and a new body design. Ion XE colored bodies are available.