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Foxtrot Mike .223 Wylde ( 5.56 Nato/.223 Rem ) 12.5" Complete Upper, 11.75" M-LOK, Non Reciprocating Forward C
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Aero Precision M4E1 Threaded 16" 5.56x45mm Mid-Length Complete Upper Receiver with ATALS R-ONE Handguard - Kodiak B
Aero Precision M4E1 Threaded 10.5" 5.56 Carbine No Forward Assist Complete Upper wtih 9.3" M-LOK ATLAS S-ONE H
Aero Precision M4E1 Threaded 10.5" 5.56 Carbine Complete Upper with 9.3" ATLAS S-ONE, VG6 Epsilon 556, BREACH
Radical Firearms Complete Upper 16" 5.56 M4 Profile w/ 12" FGS Round Rail
AR-15 Drop In Ready Enhanced Complete Upper w/ 16" M4 223 - 5.56 Barrel, 12" Free Float Keymod Fore End by Ril
AR-15 Drop In Ready Complete Upper w/ Spiral Fluted Stainless Steel 16" Heavy .223 / 5.56 Barrel, 10" Free Flo
Knights 31963 Upper Recver KIT SR15 CQB MOD2 11.5"
Aero Precision M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard - APAR70030
Aero Precision AR15 Complete Upper with No Forward Assist 16" 5.56 Mid-Length Barrel, 15" M-LOK ATLAS R-ONE Ha
Aero Precision M4E1 Special Edition Thunder Ranch 14.5" 5.56 Mid-Length with 12" Atlas R-ONE Complete Upper Re
Aero Precision M4E1 Threaded Complete Upper 16" 5.56x45mm Mid-Length Barrel ATLAS R-ONE 15" M-LOK Handguard Ce