[The Silent]

just want to add;im planning to get the or version;the one that has a longer barrel;saw the hopchamber and its a fixed model;is the adjustable hopchamber version compatible with the or version?

im a newbie to this rifle

If you still need to know, you'll have to get a new hop up chamber, such as the PDI chamber, which will fit it. I have it myself on my Maruzen Aps-2 LRV (Long Range Version), which I may well give a review on, as I sense a lack of reviews on this gun
So yes, installing an adjustable hop up chamber will fit, as all versions are essentially the same internally, the only difference I'm aware of is the length of them
Does that help?