Some other drop forward on some one else's marker.
98c, Flatline, expansion chamber, rocket cock, 20 oz CO2 w/ anti-siphon, Fighter X 7.0 drop forward.
It's super cheap ($8 off ebay), made out of aircraft-quality aluminum, Very solid. It's Fantastic! I would've paid like $30 for this thing, but I'm glad I didn't have to. And mine came in a cool tube thing with a red top.
It's only in black. I guess that's only bad if you really want a really shiny marker. I don't so it's perfect.
This thing's great. Better than those drops that cost a ton of money and don't work as well. It also moved the center of gravity on my marker so it's right by my trigger, so it's very balanced. I wish fighter X made more stuff. I'd buy it.