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  1. Aero Precision M4E1 Threaded Complete Upper, 18" .223 Wylde Fluted SS Rifle Length Barrel w/ ATLAS S-ONE Handguard
    M4E1 Threaded 18" .223 Wylde Fluted Complete Upper Receiver w/ ATLAS S-ONE Handguard
    As low as $509.99
  2. M4E1 Threaded 11.5" 5.56 Barrel Complete Upper Receiver w/ ATLAS S-ONE Handguard
    M4E1 Threaded 11.5" 5.56 Barrel Complete Upper Receiver w/ ATLAS S-ONE Handguard
    As low as $404.99
  3. new
    M4E1 Threaded 11.5" 5.56 Barrel Complete Upper Receiver w/ ATLAS R-ONE Handguard
    M4E1 Threaded 11.5" 5.56 Barrel Complete Upper Receiver w/ ATLAS R-ONE Handguard
    As low as $404.99

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