Re: Is it common to have bad machining on GP100?
Some looks like just plain sub standard hand finishing. Those digs around the ejector rod look typical for someone hogging out material because of not having his air motor under control. I would definitely send it back to Ruger.
I tell you, I like Ruger but my GP100 had issues too. What I noticed on mine is an unequal amount of material removed from one side to the other on the frame and barrel. Look at the flat on top of the frame and see if it's centered to the top of the barrel, then look at the muzzle end and see if the barrel wall looks slightly thicker on one side. I called Ruger and they just said "you'll get that with hand finishing". I call BS, their CNC should be machining everything pretty even and hand finish not removing more than .001"-.002" to remove tool marks. All I can say is that kind of asymmetry wouldn't cut it in the mold shops I've worked in.
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty, or give me death!"