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A few points.
The multi position PMC adjustable blocks do not use a threaded screw but rather a cylinder with varying hole sizes that rotates and held in place with a horseshoe (I forget the real name) retainer on the oposite side.
The multi position blocks tend to get either carbon, copper, or both built up if left in one position for a number of rounds. It makes it very difficult to change the setting without proper leverage.
I used a YHM diamond FF that I picked up off the AR15 EE and dremeled off some of the area.
Sometimes I can manage to change the setting but I had to resort to pliers or some other device to get enough leverage to change the setting.
I should have just got the hex head adjustment since I can't manually adjust most of the time anyway.
I leave mine in the full open 90% of the time anyway.
The blocks are still a great product at a great price and made by a great guy but know what to expect.
Good luck on the build
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Threaded Mode