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Colt ar15 upper receiver production codes

asa-vnasa-vn Member Posts: 65 ✭✭
edited January 2007 in Ask the Experts
Are all Colt upper receivers marked with a production code on carry handle below rear sight adjust? I have seen codes CM CAF...Does anyone know of CK ?? How about no code or marking at all...could it be genuine COLT [?]
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