Yeah, for FPS I think it can be improved quite easily. I noticed the nozzle doesn't stick in the hop at all which means there isn't a good seal.
A method I've used to improve the seal on other pistols is to paint the outer nozzle with some acrylic. You know the oil based permanent marker pens.
I took the hop apart and its unlike any I've seen before. Very basic and unfortunately I don't think it can be improved with any third party bits because there aren't any.
I think I will make a video about all this.