On the stock and buffer question. I don't think you are going to have a problem . The shorter buffer is not there to change the timing on the rifle. The shorter buffer is necessary because the collapsed 3 position stock can't physically fit the larger solid stock buffer.
Did you get two springs? I will have to check but I thought that the springs were different between the two. Maybe not.
The 11.5" barrel and 5.5" should give you good combat accuracy.
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