It does have a texture like a cast part, though I don't see any mold lines or seams. And no bcm markings. And appears to be parkerized like an a2 hider. So I'm assuming it's a copy. Either way, it's a nice like piece I have no use for.
I'm pretty sure I bought it at a local gun store just to use it as a thread protector. I later went with a taper mount system and all my "thread protectors" went into a bag