I wouldn't do it. A Titanium plunger (with spring included) is pretty inexpensive and makes a noticeable difference in the trigger pull.
http://www.brownells.com/aspx/NS/sto...20for%20GLOCK~
The Titanium striker is more expensive. Also makes a huge difference. Nice if you want to spend the hundred bucks.
http://www.brownells.com/aspx/NS/sto...NIUM%20STRIKER