That screw isn't enough to hold the block in place. I had this on my .223 pistol upper and it walked even with the dimple so I drilled the front strap of the block for a taper pin and had planned to install another in the rear when the front one had been set. Now I've sold that barrel and have switched to a 300blk and will be doing pins on it.
The screw is simply too small to do anything effective. Someone had a "great idea" that didn't work in reality. A 3/16" roll pin is cheap insurance. I happen to have a tapered endmill that fits my taper pins, so I use those. If I didn't, I'd use a roll pin if it might be a mission critical gun.
I'll be working on that upper in a bit, I can take pics of the FSB then.


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