3d print a thread adapter like they do for the glocks one that mounts on the rail underneath the barrel and sits flush with the end of the barrel so you can mount a tracer...
Mine came with 5 Disks and you can get them super cheap, so they're better than other magazine fed airsoft pistols. It's a real bargain for any players out there.
The H8R is great. There are so many kits for it (including some HDR.50 kits) and a bunch of mods that I'm actually considering having a whole collection of them. The only issue I have is that the whole grip isnt removable. It's not very comfortable for me and I would have liked to design and print my own grip. I still might be able to work around it somehow.