This is my custom 260 that has never had off the shelf box ammo fired through it. It started its shooting career as a single feeder so length was not as important as it is when im trying to get the mag to feed. I have kept having to shorten and shorten. I have them down CBTO of 1.190 using the 5-26 comparator . Now when I load I think its called an AICS, mag that normally holds 10 rounds with only 5 the first round wont feed. The solution is to run my finger back from the front. After the first on strips off all the rest feed fine. If I only load one and hit the clip in with malice, then it will pull that first cartridge into the barrel no problem. But any combination of 2,3,4,5 etc. 80% of the time or more that first cartridge gets stuck. Now if i push down and back on the back end of the cartridge then it pops the front up and it loads no problem. Does this sound like a mag issue?, follower hang up?. I tried a 308 5 round mag pul aics mag and they wouldnt feed at all, no way.

Hope this makes sense.