Of the three magazines I have for my MKII (not MKII/45), all three suffer from this problem: When I load 10 rounds and fire the first, the gun ejects the empty case but won't feed the next round. When I manually cycle the bolt, it picks up the next round and usually things work fine after that. Since I shoot regular bullseye matches (Yes, one handed), this is a nuisance.
I have cleaned the mags and even installed new springs from Brownells. On a full mag the follower is just real slow moving up. Any ideas?