The first step in removing the factory logo is to use a small flat punch and lightly tap the letters as closed as you can get them, you will be able to turn them into a blur but not get rid of them. If you try to file them off without punching them closed you will have to remove twice as much metal and they may still show.
I was indexing a breech plug on a GM barrel and was having a bad day, I kept having to go one more flat, then another and finally had the plug index perfect except the GM logo was on a side flat instead of the bottom. I said to heck with it and punched the letters closed and filed them off.
No logo to be seen above the front lock panel.
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