I randomly encountered this vid on YouTube: The Jerry Miculek Magnetic Buffer System.
From context, I surmised (correctly, as it turns out) that the "buffer" in question is the weight that slides back and forth, with a spring pushing it forward and the bolt carrier pushing it toward the rear, within the stock tube of an AR-15-pattern rifle.
So, what's with the magnet?
Watching the vid, it makes sense: he's using two opposed magnets at the back end of the buffer weight to provide a smooth stop & rebound when the buffer bottoms out against the back end of the tube. Apparently this is a thing. And, given that it is of concern, that's a darn clever way to address it.
My first thought on seeing the title was that he was using a magnetic buffer to get dynamic braking relative to the aluminum tube (it is aluminum, right?) and dissipate some recoil energy by way of heating up the tube. Which... I'm not sure if that would be a good thing or not. But, given that the braking would be a function of speed, it might actually be a useful effect. How much it would heat up the tube is another question. (Yeah, I could probably math it out to some first approximation, but I'd have to do a bunch of research first, and did I mention I'm lazy?)
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