This is probably a dumb question but it might save me some time to ask. I have always looked at lower kits and upper kits, even assembled uppers. I have a couple Spikes lowers from back when Obama was going to be elected president. I have a read a lot of advice about getting good triggers and good barrels and the rest doesnt really matter etc. Lots of good, similar advice here as well. So when you choose a good barrel, do you then have to order ever little pin spring screw and gas tube/block etc to complete the build?
I won't deny that a barrel is important. But, I think the bolt and carrier are more important. If you are building your own, start with Toolcraft.
https://www.righttobear.com/toolcraft-phosphate-158-MPI-M16-BCG-p/tooauto-011.htm
