Where's my popcorn??? LOL I'm not getting into this one, but i sure as hell will watch this thread. 
EDIT:
Darn, you had to edit it.
About how they make the inserts. I don't know how they make them. As a machinist, and if i had to produce thousands, i would order extruded tubing with a little meat.
If that's with SS inserts. I would bore the ouside, mill them to length (perp to the bore) and grind the outside with a cylindrical surface grinder.
If it were alu. I would probably ream the inside, mill them to length (perp to the ream) and turn the outside on the lath.
Granted, with insert barrels, you have a bigger addition of tolerance issues: Inside of the barrel where the inserts are, the outside of insert and inside of insert. They all have to be concentric compared to 1 piece barrels where you only need the inside of the barrel.
Producing them from billet is out of the question though. There would simply be too much waste.

EDIT:
Darn, you had to edit it.
About how they make the inserts. I don't know how they make them. As a machinist, and if i had to produce thousands, i would order extruded tubing with a little meat.
If that's with SS inserts. I would bore the ouside, mill them to length (perp to the bore) and grind the outside with a cylindrical surface grinder.
If it were alu. I would probably ream the inside, mill them to length (perp to the ream) and turn the outside on the lath.
Granted, with insert barrels, you have a bigger addition of tolerance issues: Inside of the barrel where the inserts are, the outside of insert and inside of insert. They all have to be concentric compared to 1 piece barrels where you only need the inside of the barrel.
Producing them from billet is out of the question though. There would simply be too much waste.
As to the TROLLING
go look up at the top of the post bud I posted before you,... Of course I will close with " so dont drag your teeth sweetheart ba bye dont play with the big dog unless you have teeth.... On a last note I AM WHITE and listen to metal (you are a rasist pig to assume anything by the spelling of my name ) I am also named SUMTHINWICKED to honor a band I like.

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