With my TM G17 I got all the parts from the factory so they were never installed in a frame.
That being said I noticed there were some small areas that were rubbing so I filed them down and now the hammer functions with less resistance. I'm guessing that if you got a Glock that was already assembled you shouldn't have to worry about rubbing though it doesn't hurt to check.
All it took was less than ~.5mm on the valve knocker catch to cause an issue, after filing it functions flawlessly. I also removed a bit for either side of the hammer where the pin goes through and from the hammer chassis where the valve knocker pokes through.
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