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ran 360 rounds through it today, half of which suppressed with my YHM phantom.
In the suppressed setting it was pretty gassy, more than I expected. I assume once cut down with the appropriate gas jet it should eliminate some of the gas. I also noted some stringing with the 20oz YHM can hanging off the end of it once it was really hot (i was hammering plates at 200/300y).
All in all its a sweet shooter cant wait (but will
) for my form 1 and my super scar trigger which should come this week.
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I hope you have better luck than I'm having with the gas. Mine was cut down to 10" and came back with a 1.8mm gas jet installed. It ran reliably but with the can (M4-2000) it was excessively gassy. I tried jets sized from 1.35mm, 1.4mm, 1.5mm and 1.55mm. All of those would cycle and lock back while suppressed (still more gassy than i'd like) but it would not cycle unsuppressed (in the unsuppressed setting of course) at all. I had to step up to the 1.6mm to get the gun to run reliably without the can but now with the can, it is painfully gassy. I'm not even sure where its coming from, it just feels like it shits carbon in my face and is potentially coming from the seams between the lower receiver and upper and even the buttstock. This was with lake city M855. I enjoy the gun far more without the can than with right now and that's a shame.
My 13" barreled 17s with a 1.35mm gas jet runs beautifully without the can (SDN6) and with it is not gassy in the least bit. I would very much like to get my 16s to that point but I'm not sure what else to do. (Note: I've ensured the Piston is clean, gas rings are not aligned, piston chamber is clean, ports on the gas valve are clean...)
Fin, I hope you can figure it out for the both us.