I, too, installed the MCARBO trigger guard and noticed how stiff it was. When installing the next few MCARBO items, I always checked the spring placement, etc. for the guard to be sure it was installed correctly. Mine is stiff when pushing it to fold up, a little harder to one finger operate it than the factory guard without moving my hand from the shooting position, but snaps back into place just fine. And I like the solid stiff aluminum feel. This is something that I just don't see me needing to push and fold up quickly while defending my family. My S2K still unfolds quickly and snaps together solidly. Those are the important moves.