Look at the bottom area of the last photo, where the upper receiver and the frame rails interact..That area of the frame should be perfectly flat and evenly radiused all the way to the trigger guard. As is obvious in the photo, this area of the frame has been ground down.
Now compare it to the exact same area on the other side of the frame, (upper part of photo). Notice that this side is ground down much less, making the grind fairly uneven? This would never have happened if this had been factory finishing.
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