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OC, I don't know what part you're making reference to, but the item in the above pic, and the item we're talking about is a drop-in auto safety sear. It has nothing what-so-ever to do with the semi-auto function of an AR.
This part only exists as a substitute for the original auto safety sear in an M16 type weapon - rather than drilling and milling the receiver to M16 specs the part functions to hold back the hammer from falling during the cycling of the action in full auto fire.
Both the DIAS (in non NFA registered form) and the Lightning Link (similarly) exist and are popular only because they allow non-licensed individuals to create unregistered NFA weapons out of semi-auto AR variants. Both the DIAS and Lightning Link are subject to mechanical failure far more often than the real thing, and each have to be "tuned" to the individual weapon they're installed into - there's a solid reason why a registered converted AR to M16 lower receiver goes for so much more than a RDIAS (registered drop in safety sear) or a registered Lightning Link.
I'll let you in on a little secret as well. Pre-86, many individuals were selling unregistered "conversion kits" for a whole range of semi-autos, and many of the DIAS's for AR's were deliberately manufactured significantly out-of-spec. The manufacturers and sellers of these kits knew that they couldn't be prosecuted for selling a conversion kit that wouldn't "convert" the gun, and they also knew that a customer that attempted to convert their piece outside of the NFA wouldn't be likely to file suit over an out-of-spec kit.
Now I won't speculate why a "class three" would manufacture a post sample RDIAS (requiring a dedicated love letter from an LEA for another NFA dealer to lawfully possess same - meaning the "class three" would be stuck with it) rather than mill & drill a semi-auto AR receiver, but maybe the guy you know needed to manufacture something fast to keep his SOT status. Since no LEA or Military org uses RDIAS in their weapons, it's beyond me why any SOT would manufacture one.
Or perhaps somebody is blowing smoke up your fundemental.
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