If the upper receiver serial number matches the rest of the gun parts serial numbers, then it is likely that some previous owner ground off the year stamp that should appear above the chamber. Only some good photographs can provide more detail than you have already been given.
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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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