I'm not saying that folks haven't had legit issues, but simply that I've run a lot of rounds through 2011 magazines without problems.
Look very carefully at the feed lips on your magazines. About 1/16-inch down the tube from the feed lips' edges, you should see a small indented line parallel to the feed lips for the length of the feed lips.
This line indented into the tube is where the tool bends the feed lips to shape over a mandrel. On magazines with misshaped feed lips, you will see that the indented line is not the same depth for the length of the feed lips.
In fact, I have magazines where the line is very deep at the back of the tube and not even visible at the front of the feed lip on one side of the tube only. The other side of the tube will have a line that is indented differently.
The best that I can figure is that either the tool turned very slightly or the tube turned slightly on the mandrel during the forming process. This bends the feed lips unevenly.
On magazines with feed lips that formed correctly, the line is the same depth on both side of the tube from the front to back of the feed lips.
I have 9mm magazines. The magazines I have would run FMJ round nose bullets. They would not run 147 grain FMJ with the flat nose. If the feed lips are reverse tapered, that is, wider at the back and narrower at the front, the cartridge is tipped downward very slightly when it is at the top of the magazine and held by the feed lips.
On the 147 grain bullet, the corner formed where the flat meplat meets the ogive would catch on the feed ramp, flipping the bullet out of the magazine base up - which, of course, jammed the gun.
When the feed lip opening is tapered correctly (wider at the front and narrower at the back) the cartridge feeds tipped slightly up. This aims the bullet directly at the center of the barrel and allows the slide to strip the round directly from the magazine into the chamber.
To correct the taper, I used the Dawson magazine tuning kit mandrel, several brass hammers, the Dawson magazine pliers, and a pair of Knipex smooth jaw assembly pliers.
The second problem I had was with the followers. All of the followers had plastic molding flash (small fringes of plastic) hanging off various parts of the followers. This would cause the follower to bind in the tube depending upon the interior size of the tube.
The final problem was the tube itself. The tubes are welded on the front, interior of the tube and you can see the seam if you look carefully. Seven out of the nine magazines I have did not have the weld seam ground flat at the top of the tube.
There was a little bump at the very top on the interior of the tube. This problem combined with the flash on the plastic follower caused the follower to intermittently stick in the tube and not reliably lock the slide open when the magazine was empty.
The solution was to take out the follower and sand all of the flash off of it and flatten the weld seam bump on the interior of the tube. Once this was done, all of the magazines would lock the slide open when empty because the follower could smoothly travel to the top of the tube and lift the slide lock lever.
It took about 20-30 minutes per magazine to correct the feed lips, smooth the interior of the tube weld seam, and dress the followers.
The magazines will reliably feed mixed loads (115, 124, 147 grain) cartridges with different bullet shapes and will always lock the slide open.
I don't mind tweaking things, and the required modifications are straight forward as you can easily see the problems and also see when everything is working correctly.
I may have gotten a badly QC'd batch of magazines, I have no idea. I do know that if you saw the magazines I have before I worked on them, I could show you every problem with them and easily demonstrate intermittent feed problems and slide lock problems.
I could also rectify the problems as you watched and demonstrate full functionality when finished.
I'm glad all your magazines worked for you, but I think as you can see, I'm not making all of this up, as I can describe the problems in detail and how to fix each of the problems.