Well, after owning and having some fun with the benelli M3, I decided to get it sent off to someone who welds the shell lifter together so that it no longer pinches my finger/thumb (as it was doing annoyingly often). I disassembled the gun, poped out the trigger group, and sent it off.

Now, for the life of me, I am unable to get the trigger group back in. I have tried pushing it in with the gun assembled, disassembled. It doesn't seem to want to go in easily. Is there something I am missing? Is there some trick to it?

What's going on here?