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Originally Posted by gandar
Very cool. I've used broaching to form splines on the inside of a hole before, so I'm aware of that technique, and I would be inclined to agree, for the depth of the groove, you could probably just deburr it with some sort of abrasive paste/liquid. Is it feasible/easy to do on a consistant, helical path down an entire AEG barrel?
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I have no idea as I have little direct experience in the techniques. I would think that a viscous paste would tend to follow the grooves. Even if it didn't, it'd wear off burrs.