The finish of the upper receiver in your photos looks like it has been reblued because of the "brushed" appearance of the steel and the finish doesn't look much the the byf 41's I have seen. That just could be the lighting in your photos, but my impression is that the finish and lack of acceptance proofs on the right side indicate that this receiver was refinished IMHO.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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