NWhich certainly shouldn't be taken to mean that all trophy engravers are capable of engraving an AR15 receiver, or at least doing it well.
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Spikes, ARFCOM, among others have done this in the past until it was pointed out to them they were violating Federal Law.
i believe ucwrg used to offer their lowers as sbr's. You needed to specify the barrel length when placing an order. I think they stopped after sh.
Also, I have seen factory bcm sbr lowers. I asked Grant about getting me a couple and was told that they did in fact once offer them, but no longer.
Looks like you can buy a stripped SBR lower here:
http://www.capitolarmory.com/nfa-c4-...-receiver.html