An enhanced hop up chamber designed by Maple Leaf for the VSR-10. To adjust the compression, simply move the lever which is prominent on the left side of your rifle just like the original unit. Adjusting the hop you'll find that it will click with every 'mm' of movement which certainly helps with fine tuning and ensuring that it stays in place. The hop arm is made from CNC Aluminium and has a flat point of contact, made to work with Maple Leaf hop rubbers for maximum effectiveness. The BB stopper is also made from aluminium which is a nice durability upgrade over the former plastic one.
Please note that this unit will not work with bridged barrels.