It lives!!!
It is cycling now and still seems to be quite accurate but accuracy testing is still a few weeks away.
By switching to a slower powder (WC680) (BTW, Thanks for the info Artful, it pointed me to the solution) I didn'y have to make any more mods.
So what I have is a 16" M1S barrel w/carbine gas port and A2 stock. The only real mods are using a carbine buffer spring, removing the weights from the rifle type buffer and of course 9grs of WC680 pushing a 200gr hardcast gas checked bullet (Lee mold).
I guess now I need to load up a fair size batch and sure they are reliable.
Yeehaa!!! I got my subsonic AR running!!!
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