Federal Concepts FEDA VALVE - how to install. 

Different for every setup, most guns can achieve 400+ fps and you can close the valve entirely so you can go as low as you possibly want

Lowest is basically 0 as you can close the valve all the way. Highest FPS it will depend on the setup, gas used and weather. With stock setup I was able to reach almost 2J using 0.36g with 150psi gas at around 30°C. Sorry for the late reply, I was off the channel for some time. I intend to post new content as well as a new improved installation guide and some testings and comparison between FEDA, Ratech and Revanchist valves.

Federal is going to launch the new V3 valve, hopefully on the next weeks.

@@JunPT266 Great, thanks! Gave been monitoring the website and hope to pick up a couple in the next few weeks.

Probably not, specially because the shape of the valve.