My mistake, 10.5"
Cry harder Indiana. 
One more thing.
Older 9mm bolts are not ramped. They need a 9mm or non notched GI type hammer, or it will likely cause malfunctions.
Current ramped designs can function with most any AR trigger, but 9mm recoil can damage some.
Nothing to cry about. Clean your shit up.
And so is the Centurion. So that would be correct, and worth it. Why change triggers if not to make a significant upgrade and it can be done for $100.
PB
Agreed. Upgrading the trigger is a no brainer