You can buy one, sure. But you can spend $3-5 and possibly learn a new trick as well.
Since you said you're not sure of your knowledge, you might want to read it a few extra times and be able to take the gun apart and reassemble it without any problems first.
Grind it:
http://www.ottersccustoms.com/blade.html
(You can ignore the part about drilling and tapping for the set screws, but they are nice to have. Your trigger should already have one screw on it at the top though.)
And magnet mod it:
http://www.ottersccustoms.com/magtrig.html
And if you're feeling up to it, change out the switch.
http://www.ottersccustoms.com/switch.html
You needn't spend the $10 on the switch. Radioshack has a similar switch for less than $3.