Good partial upgrade. Will somewhat smooth trigger pull and potentially lighten it a little. It is especially helpful with the Burwell trigger polishing job linked to above.

Installing just the Apex striker block (safety plunger) can also affect timing somewhat because of a different (better) contact surface with the trigger bar. Be prepared to do minute adjustments to the “candy cane” loop on the trigger bar, per Apex instructions/YouTube videos.

However, the Apex triggers and sears actually change trigger pull characteristics, as noted above. Putting in just one Apex part is like putting just two high performance tires on your sports car.