No, it does not have an adjustable gas block.
I have found no issues shooting suppressed or un-suppressed. Will even cycle un-suppressed subs no issue
No, it doesn’t but you can buy one from Aero Precision if you really want one. I really wish they would just have a separate line that already has a pre-installed from the factory! Honestly, though I would look at a Riflespeed adjustable gas block. Tool-less, “on the fly” adjustments. Whenever I go to the range, I always seem to forget my wrench in order to adjust my gas block, this solves the problem.
Not mentioned, definitely not at the price they have it posted for.