Criterion No4 barrel

[ireload2]

Following an armorer's processes for fitting a one size fits all barrel to a box car full of old receivers is not going to work.
Sure you can shim or use headspace rings. Why not buy a barrel with an extra .040 or so of shoulder?
Oh the headspace might be off? Well it might be off anyway. Fix it with a chambering reamer and bolt heads.
You will get a better installation if you can use a mandrel through the bolt race to permit facing the receiver off square to the threads.

Large numbers of components and the use of a scrap bin allow armorers to swap parts and fix most problems at the tax payer's expense.
These new barrels are being funded by many individuals that have to make one barrel work on one rifle. You will probably need a lathe...

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[bigduke6]

You will probably need a lathe...

I would say " certainly need a lathe plus the finish reamer"