With the Summer release for the Wolverine Single Moving Part (SMP) Technology to replace AEG Gearboxes and use HPA as power source, The Grange Airsoft announce that they are stockists of this product and are now accepting pre-orders... "The introduction of HPA (high pressure air) technology into the airsoft market ushered in a new era. HPA technology carries with it the highest level of reliability and performance that is virtually unsurpassed.