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Aero Precision M4E1 Threaded 14.5" 5.56 Mid-Length Complete Upper Receiver w/ ATLAS R-ONE Handguard - Anodized Blac
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Bushmaster XM-15 Complete 5.56x45mm Upper Receiver 16" Barrel - 00-400003-BLK
Stag Arms STAG 15 Tactical Complete Right Handed AR-15 Upper Receiver, 10.5" Black Nitride Barrel with Aero Precisi
Aero Precision AR15 Complete Upper with 16" 5.56 Mid-Length Heavy QPQ Barrel & 15" ATLAS R-ONE M-LOK Handg
Aero Precision M4E1 Threaded 8" .300 Blackout Complete Upper Receiver w/ ATLAS R-ONE Handguard - Cerakote FDE - APA
Aero Precision M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver - Anodized Black - APAR640211M1
Plum Crazy AR-15 Complete Lower Receiver - Black - PlumCrazy TM
CMMG Banshee 300 MKGS Complete Upper Receiver Group Kit 5" Barrel 9mm - Includes (3) 30rd Magazines - 94F17AA
CMMG Banshee 300 MK57 Complete Upper Receiver Group Kit 5" Barrel 5.7X28 - Includes (3) 40rd Magazines - 54F18E9
Surefire Institute California Compliant Complete Lower - SFI-15
E3 Arms AR-15 Improved Gen II Complete Polymer Lower Receiver
Plum Crazy AR-15 Improved Gen II Complete Polymer Lower Receiver, Ready to Drop in and Push Pin. - Black
E3 Arms Omega-15 AR-15 Black Polymer Complete Lower Receiver