Quoted:
Quoted: I think those classify as "duty rifles", as in "Active Duty in Global War on Terror", yes?
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Do you want to go through a bayonet course with one? DMRs are a 'special purpose' weapon, not a general issue. They are also intended to be used with optics
If you can loosen the screw to adjust the zero of the front sight, then dollars to donuts you can wack it hard enough to move it. Maybe it's just the engineer in me, but a friction fit doesn't seem to have the strength to prevent rotation that a double pin setup has.
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Generally, the screws are adjusted once, then loctited in place. you can search in the "barrels, uppers, etc.." forum for an old discussion about set screw FSBs, where an GWOT/OIF veteran discussed the durability of his set screw FSB, which was on an M4 upper. I think an approximate quote was "Sometimes you need leverage to get those cot frames put together."
also, maybe it's the engineer in me, but you seem to not completely understand how the setup is put together. There are milled flats on the barrel that opposing set screws tightened against.