HW/Weihrauch Deburring Weihrauch

I use these small files. They work great.
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Crow
 
Find a close fitting socket and wrap it with blue painters tape, then 1500 grit on double face tape, to a nice snug fit. I have a cut off extension to chuck it up. This will really polish up the interior. The piston on a buffing wheel and all edges with needle files then a Dremel with firm buffing wheels.
 
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Or wrap scratching paper around a broom handle that best fits the tubes contour.. lol
That's what I use wooden dowels and sandpaper glued on the bottom, for the bottom of compression tube. Then blue shop towels with solvent wrapped around the wood dowels to clean insides. Small files and 400 to 600 paper for burrs. You can polish the piston in hand with 600 paper and a little alcohol. Many ways of getting it done.
 
ball hone,,, quoting motorhead
"Tearing it apart did a ball hone job on inner tube surfaces placing a nice cross hatch on compression bore & also deburring the cocking slot & holes that the seal must pass over when fitting said seal and final assembly. "
 
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- I use a Dremel for deburring/polishing most everything, but be careful not to mare the blueing when doing the receiver slots.
- I chuck the receiver/piston in my lathe and sand/polish it's inside/outside with carborundum attached to a metal rod or file.
- Trigger sears on a sharpening stone and edges by hand.

As always, less is more ................ take the equivalent of roughly 2,000 shots of wear off the internals.

While this isn't absolutely necessary on a new gun, after you do one -> you won't be able to shoot a gun out-of-the box again;).