Originally Posted by ILLusion
Velocity output is determined by the overall volume allowed to pass through, as well as the shape of the outlet to direct the flow through the outlet.
The design of the ARS inlet is a bit weird, because it's opposite of what I've seen in the past. I suspected it would cause a turbulence with the output, but I wasn't aware of what effect that would have.
Could this be the cause for low velocity? Possible. The design goes completely opposite of what's worked in the past. Does that mean going against the grain couldn't work? No. But in this case, this application didn't work so well.
Heavy weight doesn't affect velocity. By the time it starts its cycle to close off gas flow to the barrel, the projectile has already left a relatively long time ago.
Heavy weight affects how quickly it will close. You want it to close quick to begin the slide cycle quickly, and to save gas. Secondly, you want it to close quickly for a snappy blowback feel.
***OFF TOPIC RESPONSE HERE***
So ILLusion, does the Action bulb (aluminum or whatever it is, with O-rings) actually close quicker than the stock plastic floating valves?