Just finished my first 80% lower using your jig and a practice generic lower. It's not perfect but way better than I expected! I think I can say with confidence the sloppiness is the result of a crappy Ryobi drill press. After a few adjustments it cut very well but the depth stop is horrible and left the bottom of the pocket with some dimples due to the inconsistency of the depth stop. Oh well...live and learn! I think it's purely cosmetic.

On one side of the lower (hammer pin hole) there is a slight raised jagged edge. All the other hole surfaces are very clean and smooth but this one is slightly raised and jagged when running a fingernail over it.

Is there a good way to smooth this down without scratching up the finish? I can sand or file it but obviously that will ruin the anodizing. 

Any suggestions for a newb?