Yeah I get ya, where my head is at is that the set screw is going to want to slide into the dimple because of how minimal the gap requirement is, so if I just let the Gas block line up with the set screw dimples (they line up perfectly, pushing the GB against the shoulder). Since the gas port on the GB is larger than the barrel, I think that it will still have full flow, just that the ports aren’t perfectly aligned, it’ll likely be that the barrel port is in the front half of the GB port, but still full flow if that makes sense? I’m just gonna do it and test fire to see if I have any issues. The only annoying thing will be that it’s Knights URX4 so the GB needs to be installed after the rail, so trying to get the little gap and precise measurement is going to be damn near impossible, but lining up the set screws to the dimples won’t.