The screw has a non-standard "tit" on it. I'll get another pic for you. But it is certainly a "tit" tip that obscures about 2/3 of the gas flow.
Unfortunately, I haven't found anyone selling just the valve...because at $30 for a valve, let's face it, nobody'd buy it!
Nonetheless, it worked pretty good for me, so I'm going to give it another go and install it on the pistol tube.
Speaking of which, my pistol tube arrived today from Model 1. Unfortunately, it's a half inch longer than what I'm currently running... :(
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