Originally Posted by DuraCoater
We hope an even more future version will feature a "clicking" mechanism so that the gas adjustment setting can easily be identified and set by the user without trial and error. Maybe even pre-etched values so a user can visually set the gas valve to the required setting. (Imagine if you will a channel dial on an old school TV, but much smaller obviously!)
I spent 4 years with an M249SAW. This knob you speak of exist and has been around for a while.
A thought though...
The knob on my SAW was fairly large and round, stuck out quite a ways too...
So, maybe a lever, mounted directly to the gas block? Accessed by a slot through the hand guard that the tip peeks out of, slide it back and forth.
Much like a tang safety. Can be mounted to operate length wise or transversely.