Quoted:
Quoted: Are you talking about installing a setscrew to keep it tight? YES I didn't do it, but I thought long and hard about doing it when I had my YHM FF. Instead, I disassembled the upper and recycled/sold the parts, as applicable.
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What did you get instead? A better FF?
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I went to DD rails.
To me, the setscrew installation would be pretty easy if you had a drill press. I'd drill a hole, halfway into the rail lock nut and halfway into the rail. If I'm picturing everything correctly in my head, you'd drill through both of those and into the barrel nut itself. I'd try to hit it in the web between two holes in the barrel nut, so there is more meat to thread for the setscrew. I would only drill the length of the setscrew plus enough length to get a bottom tap in there to give you enough threads for the setscrew to sit at least flush when installed. After threading, I'd install the setscrew with some Loctite 242 (blue Loctite). I'd have absolutely no worries from that point forward, as there will be no way for anything to work loose and the rail itself is going nowhere.
That's just me, though. Some say I'm stronger than I look/than I think I am and I twisted off two YHM rail systems with a FVG, so I went away from YHM FF tubes. Others have success with them.