The original barrel would have had the serial number on the bottom close to the frame. There would also be a bore diameter stamp in millimeters like "8.83"
The serial number would appear on the front of the frame under the barrel and on the left side of the upper receiver as shown in your photos.
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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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