I don't understand the question. Pivot pins/springs/detent pins are not an issue as these are standard parts and easy to obtain.
I have a nice new Armalite 7.62x51 carbine barrel with gas system/hanguard/FH etc and I need to get a bolt that will support the Armalite barrel extension.
To be honest, I'm not even going to use Armalite upper & lower receivers. I had to buy a complete Armalite rifle as a donor to get the upper & lower that I needed for another project.
I want to build a truck gun with the barrel/gas system/handguard that is sitting here & I need at the very least, an Armalite bolt.
I'll be using Aero M5 upper & lower.