Well, seems like I'm also having the same issues RadMan and dns reported. Bolt won't always close all the way, and its feeding the nose into the side of the chamber. I got two mags, tested them today with CCI Minimags, CCI Minimag HP, and CCI AR Tactical. No ammo fared better than another.
My first concern was on one of the mags a piece of cardboard that was lodged under the feed lip and between the top of the mag. I was able to get it out, but it was defiantly there from the factory. It was lodged in there tight.
Here's what would usually happen when I would release the bolt to chamber the first round, stops about 1/3 of the way.
I would get jams about every 2-4 shots. Quite a lot of the rounds ended up getting perpendicular and having the bolt slam into the side, bending the casing.
You can see all the banged up noses and bent casings. This was only a handful of them.
Any suggestions of what I should do? I put about 250 rounds through each mag so far, failure rate of about 60-70%. I should note I also tested my factory ruger 10rnd, not a single issue with about 50 rounds of the various CCI I was using.
Edit:
Took the mags apart to have a look inside. One thing that makes me wonder, is the gap between the mag and the feeding lips where the tip of the bullet would raise up against be affected by the rather large gap between the two pieces??
Here is with a bullet in (bottom plate removed and holding the spring/follower in place with my hand). You can see the nose of the bullet would probably be rubbing against that opening, which can't be good for feeding?
Some other people have said using silicon spray on the inside of the mag might help smoothen things out? It's bone dry in there...