I'm having issues with the fit of the trigger group as in the lock up. The gaurd Has little to no tention when snapping it into place. As far as I know I need some. Also I have about 1/16" gap at the heal of the receiver as well. Am I going to have problems. Some of my mags have a hard time even locking into place some don't. That tells me that the trigger group has to come down some the mag that has a hard time is a springfield mag the outhers are unmarked not usgi but function well only a few take a good hit to the bottom to seat em. Anyone have any ideas on what I could do? What should the thickness be on the front and rear pads of the trigger group? The trigger group is all non usgi. I have a springfield loaded in a sage mod1. Thanks for any help.