I very rarely shoot with my Beta C mags. In fact I decided after making a large ammo purchase to shoot up the ammo in all three that I have. These have been loaded and stored for a little over a year. Two of them have never been used until today and the third has had maybe 500 rounds or 5 cycles thru it. I cannot tell which one it is, but maybe its the one giving me the problems. the first one went through all 100 rounds with no problems. The second one was a total disappointment, three shots and then it tries to feed two into the chamber. Two more shots, the same thing. I looked at the feed lips and compared it to the others and could tell no difference. I unloaded it and noticed the rounds were not coming up as fast as they should with about 50 rounds left in it. Almost like a weak spring. I set it aside and loaded up the third mag, and it went through all with no problem. I came back into the house and emtied the problem mag and dumped some of the graphite lube in it and reloaded it. Went outside and the same thing happened. I sit here now not being able to find any of the destructions on disassembly that came with all three wondering what to do. Anyone out there got the disassembly instructions or know where I can get a copy?