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Posted: 10/10/2011 10:20:21 AM EDT
| It doesn't concern me in the least but it has me curious. Yesterday I was cleaning one of my ARs after shooting and noticed that the bolt was magnetized as i was slipping it back into the Bolt Carrier. I thought I vaguely remember another post about this but I couldn't find it via search. Anybody have a link to it? I thought it was neat/interesting. |
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Sounds to me like they forgot to de-magnetize the bolt after mag particle inspection this there are a lot of companies that don't give a fuck about how to do MPI correctly...  Is that language really necessary?  Well somebody is obviously a little disgruntled.. |
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i thought dropping something that was not naturally magnetic demagnitizes it? somethong about randomly arranges the molecules rearranges the alignment of the molecules, but really inorder to get it really demagnatized you would need to drop it TONS and have it hit a hard surface TONS. you could also just pound on it with a hammer... OR I wonder if shooting would demag it. impact forces, BUT movement of steel on steel could magnatize it due to alligning it. interesting MYTHBUSTERS!!!. |
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If you have a strong magnet, like you use for picking up nails in the yard, you can try dragging it closely by your bolt with a whipping or sweeping motion from the face to the stem or vice versa. You may have to try it both ways. Just about any welding or machine shop should be able to take care of it too.
I've never de-magged a bolt but I've de-magged everything up to a 36" pipe, turbine blades (aero and power generating), etc.. Remember when you're messing around with strong magnets to keep your credit cards and cell phone far away. I had to be escorted out of a nuke plant by security, because a magnetic base camera fell and I caught it squarely in the chest right on my badge and then I couldn't get out. |
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Sounds to me like they forgot to de-magnetize the bolt after mag particle inspection this there are a lot of companies that don't give a fuck about how to do MPI correctly... Is that language really necessary? yes (sorry mom) companies use MPI as a marketing gimmick, but completely disregard the TDP, and some companies that claim MPI don't even magnaflux their bolts properly... |
| Thanks for the comments. Like I said, this bolt hasn't always been magnetized. No clue why it is now. I'll have to pull the bolt out again and see if it still is. As I said in the beginning im not all concerned about it (though there were valid points about it catching particles). Just thought it was an interesting phenomenon. |
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