.0015 tolerance is actually very good. just from machine shop and sheet metal tolerancing goes,
if you want to get anal they make a white deburring stone called Arkansas stone very hard , just to touch up
edges of components, it doesn't remove metal, just knocks off the fine burrs. and it's cheap
first thing I learned as an apprentice.
use to touch up flat surface, to remove fine hard to see burrs.
preferred method to remove debris, is compressed air, cleans out the loose burrs and debri.
wear safety glasses that's how people get crap in their eyes.
in my business , we would measure before OAL, then segregate them into same length.
then machine them off with the exact trim , stock removal. to make them all the same length.
just because I am anal, I would buy a small lathe and machine them exact.
but that's me, over kill they call me.
but I could make my own custom stuff.
I use to do it for a living..