Flash Holes

They tend to blow themselves clean, I think. While you can certainly find carbon lining the flash holes, I've never noticed that it was able to build up appreciably.
 
I "clean" flasholes with an old horseshoe nail, poking out tumbling media that gets stuck in them. I don't do anything else to flasholes, never had any reason to.
 
I've seen cleaning media get stuck in the flash hole too. You need to check, but it comes right out without any fuss. I have an assortment of pointy things, but no 'old horse'. Snicker.
 
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