I am not a gunsmith.
I dont work on guns for a living.
However I do do crack repair on a weekly basis, some non critical some extremely critical.
Having used penitrant dyes, mag particle testing and sending stuff away for xray reguarly I can say penitrant dyes would be a total waste of time and produce a unclear result on something like a bolt.....where the dyes are good is where you can see a crack and are looking for other cracks or the end of it on say a big housing or something like that....large non critical parts =good.
Mag particle testing with an experienced operator would pick it up tho most would be used to dealing with much larger parts so some could be missed.
Xray "should" pick up anything.....if the guy or girl looking at it knows their game.
If you are paying for it then tell them of the failure and what to look for.
Its your vision/life.
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