5.56x45mm NATO Upper Receivers

Brn-4 Assembled Upper Receivers - Brn-4 Assembled Upper Receiver 14.5'''' Medium Barrel Black

Brn-4 Assembled Upper Receivers - Brn-4 Assembled Upper Receiver 10.4'''' Medium Barrel Black

Brn-15A(R) M4 Stripped Upper Receiver - Brn-15 M4 Upper Receiver, Black

BRN-180~ GEN 2 COMPLETE UPPER RECEIVER ASSEMBLY

BRN-180S® GEN 2 COMPLETE UPPER RECEIVER ASSEMBLY

Ar-15 Upper Receiver Completion Kits - Brn M16a2 Upper Receiver Completion Kit

Brn-15 11.5'''' Upper Receiver Assembly 5.56mm - Brn-15 5.56 11.5'''' Bbl .750'''' Gb Upper W/Charging Handle & Bcg

Brn-15 13.7'''' Upper Receiver Assembly 5.56mm - Brn-15 5.56 13.7'''' Bbl .750'''' Gb Upper W/Charging Handle & Bcg

Ar-15 16'''' Upper Receiver Assemblies 5.56mm - Brn-15 5.56mm 16'''' Bbl .625'''' Gb Upper W/Charging Handle & Bcg

Ar-15 16'''' Upper Receiver Assemblies 5.56mm - Brn-15 5.56mm 16'''' Bbl .750'''' Gb Upper W/Charging Handle & Bcg

Ar-15/M16 M16a2 Stripped Upper Receiver - Brn Ar-15/M16a2 Stripped Upper Receiver, 5.56 Nato, Black

GVAC UPPER GROUP 5.56MM 14.5"

Black Rain Ordnance Upper Receiver 5.56 Black

MSR15 Competition Upper Receiver .223REM/5.56mm 18"

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 12.5" Barrel 10.3" ATLAS R-ONE Handguard Flat Dark Earth

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 12.5" Barrel 10.3" ATLAS R-ONE Handguard Black

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 16" HBAR Barrel 15" EM Gen2 Enhanced Handguard Flat Dark Earth

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 10.5" Barrel 9.3" ATLAS R-ONE Handguard Flat Dark Earth

Unknown Unknown 5.56mm Police Trade-In 10 inch Complete Upper

Unknown BMP 5.56mm Heavy Barrel Police Trade-in Upper Receiver

Unknown 5.56mm Upper Receiver with 10.5 Inch Barrel (No Charging Handle or BCG)

MCX-SPEAR LT AR CONVERSION KIT - 16" 5.56 NATO

MCX-SPEAR LT 16" UPPER AR CONVERSION KIT 5.56 NATO-BLACK

MCX-SPEAR LT 11.5 UPPER AR CONVERSION KIT 5.56 NATO-BLACK