Best quality reversal/anti prevention latch that ensure the gears in the gearbox do not rotate backwards causing the AEG to double-fire unintentionally. Especially if a very powerful upgrade is selected this part needs to be looked after and changed regularly to secure optimal performance. For version 2/3 gearbox. Colour blue. The ULTIMATE® Upgrade Series are made of reinforced material to secure the best performance and durability. For in-depth information on ULTIMATE® Upgrade Series, see catalogue.