My state doesn't allow suppressor, so I can only imagine the issue being discussed here. Have you guys tried side charging upper? It doesn't have the rear charging handle and the channel is plugged by a gasketed screw.
There are 2 vent holes in the bcg. I would consider enlarging and tapping them. The larger holes help vent out excessive gas more efficiently after unlocking. The tapped threads give me flexibility to sleeve or plug them when needed.
And of course how about the adjustable gas block?
-TL
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