At the risk of sounding like a moron, i have a brand new m2 tactical and love it, but today when i went to load it with 3" shells for the first time instead of 2 3/4", i could only fit 4 in the magazine, yet i can fit 5 2 3/4" shells in with room to spare. I can get the 5th 3" in up to the brass, then it hits a positive stop. I took apart the magazine to make sure nothing was bound up and all was good. So what's the deal, is it only 4+1 with 3 inchers or am i missing something?? thanks.