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upper receiver
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  1. Colt Long Guns
    Greetings! Anyone have any information on that upper receiver proof mark? Thanks in advance!
  2. Colt Long Guns
    traded an sks for what i was told was a brand new never fired colt ce1000 expanse with added fwrd asst and dust cover... i have never seen this mark on an upper receiver and i have searched and googled for about 12hrs and cant identify it. also the barrel is marked 5.56 NATO 1/7 P not 5.56...
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