I bought a ten pack of these mags from Questar, and they all feed reliably. I tested each mag at the range to ensure this. I am shooting a Rob Arms XCR. I set most of my mags up with the mag couplers, but can't imagine that making a difference, and I had no malfunctions with the mags that were not coupled either. The only malfunction of the day was a double feed from my 5/30 round mag once, likely my fault I was resting the mag on the bench while shooting.
I should add that my mags look identical to the one in your pictures, and removing rounds by hand is difficult, but not impossible. I find I have to tilt the bullet end up just slightly with a finger as I push the round forward to remove it.
I should add that my mags look identical to the one in your pictures, and removing rounds by hand is difficult, but not impossible. I find I have to tilt the bullet end up just slightly with a finger as I push the round forward to remove it.


















































