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Where did you source the carbon fiber rods?
Hot glue the magnets to the rods or some formulation of JB Weld?
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I got the CF off of eBay, as well as the rare earth magnets. I bought Carbon Fiber Tube, 4.5mm, I then bought Rare Earth Ring Magnets, that are counter sunk, used a small
brass wood screw+epoxy and screw into the tube.
I then used heat shrink wrap on the end that went down the barrel, this serves two purposes, it protects any carbon fiber that might have split when I cut the tube, and (much more importantly) it lets me know immediately if the tube broke and is stuck down the barrel. If I don't see heat shrink on the tube, I know immediately NOT to shoot the gun. I also used red heat shrink at the top where the magnet meets the tube, to indicate guns stored with loaded mags (SBR and 870).
I use the same rod for .30 cal, just use a couple extra tubes of heat shrink to fatten up the tip.
I can get a picture if you're interested.
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ETA: I do plan to change out the magnets I bought, the original ones are tiny, less than the size of a dime, they work if you're careful, but a bigger magnet would be better.