I bought a mag Pouch that came with 2 new repop mags. After a little fiddling with the feed lips they both function flawlessly, in fact betterthan the original mag that came with my carbine. No markings on them at all so can't say where they came from or who made them.

Listen I'm not trying to be an A$$ or anything but your reciever looks like it spent a significant amount of time under water. Are your raceways smooth or are they heavily pitted like the outside of the receiver? I would bring that to a gunsmith and have it diagnosed to be safe to shoot.