Barrel trimming options

[Rasmus Petersen]

I know i saw a alternativ to trimming barrels, ig was some kind of setup with a disksander and a jig for holding the barrel ?? but i cant seem to find i with the serarch option.

Or

How do you trimm your barrels ?? i might end up with an order for 100 pens and need to look at options for getting this done with precision and better(quicker) that i am able with handdrill and barreltrimmer