As a side note, I own three Springfield milspecs.
The first one, I changed parts on. I changed everything except the slide, frame and barrel. Then I changed the barrel.
As I shot it, as I got into teaching, as I learned more, both from experience and from students (yes, instructors learn from students) what I wanted in a weapon changed.
The second and third milspec are still straight stock. No changes needed.
So my side note is this: shoot 300 rounds a week for a year and a half, and then decide what changes you want to make.
"Huh?" --Jammer Six, 1998