Even if it was never installed (never drilled) it still will never "mesh" with anything factory.
So what does it matter?
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Dude,
Relax. I am pretty sure that the OP has this FSB installed on his "frankenbuild" and he was simply inquiring as to what make it may be. Nowhere does it say it is not on the weapon or laying in a drawer, etc..etc.. He probably just would like to know something about it just as others ask about triggers, hammers, bolt carriers, etc...
Perhaps there's no markings on the barrel and he's trying to determine the make of the barrel, and he just asked the question in a confusing way? :confused: