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CMMG Banshee 300 MK57 Complete Upper Receiver Group Kit 5" Barrel 5.7X28 - Includes (3) 40rd Magazines - 54F18E9
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CMMG Banshee 300 MKGS Complete Upper Receiver Group Kit 5" Barrel 9mm - Includes (3) 30rd Magazines - 94F17AA
Colt Defense Un-issued Prototype IAR (Infantry Assault Rifle) Upper Receiver W/ Knights Armament Flip-up Sights - 16&quo
Aero Precision - M4E1 Threaded Complete Upper - Semi-auto - 16" SS Barrel - .223 Wylde - Anodized Black - APAR70030
Aero Precision EPC-9 Enhanced 8.3" 9mm Complete Upper Receiver w/ Enhanced 7.3" Handguard - APAR620269M85
Aero Precision EPC-9 Enhanced 11" 9mm Complete Upper Receiver w/ Enhanced 9.3" Handguard - APAR620275M86
Aero Precision EPC-9 Enhanced 11" 9mm Complete Upper Receiver w/ Enhanced 9.3" Handguard - FDE - APAR620276M86
Aero Precision EPC-9 Enhanced 16" 9mm Complete Upper Receiver w/ Enhanced 15" Handguard - APAR620218M87
Aero Precision M4E1 Special Edition Thunder Ranch 14.5" 5.56 Mid-Length with 12" Atlas R-ONE Complete Upper Re
Aero Precision EPC-9 Enhanced 16" 9mm Complete Upper Receiver w/ Enhanced 15" Handguard - Creakote FDE - APAR6
Aero Precision M4E1 Complete Upper, 10" .300 Blackout Barrel, EM-9 Gen 2 Handguard - Anodized Black - APAR640221M4