I have just sent two of the C Products 6.8 SPC straight 20rd style mags back due to feeding issues. Does anyone know if a 6.8 SPC mag is made that will work out of the box, no tweaking? FYI, I have an M4 upper, so that should help eliminate the no M4 upper feeding issues with 6.8 SPC. The C-Products mag's followers were the main reason I sent them back. They were difficult to load and had big canting problems. I hope the replacement mags will be better (I'm hoping). My lower is a Bushmaster and I have heard that a loose mag well can also cause some issues. If anyone has any idea if PRI or another mag manufacturer makes a better mag, please let me know.