Sorry I thought it was obvious. Give it a little thought, which pin/spring is easier to replace?
Anyway, does the pivot pin stay in? Solid? If so, you should be ok as Doc said.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek