5.56x45mm NATO Upper Receivers

FightLite Industries Mission Configurable Rifle Dual-Feed Complete Upper 5.56 12.5 Threaded Barrel w/ 100 M27 Links

Ar-15 Upper Reciever Assembled - Ar-15 Upper Reciever Assembled Black 5.56mm

One Horse Complete Upper 5.56 16 Barrel

Cobalt Kinetics CK-Pro Urg Complete Upper Flat Dark Earth 5.56x45mm NATO 13.7 Barrel

Cobalt Kinetics CK-Pro Urg Complete Upper Flat Dark Earth 5.56 7.5 Barrel

Cobalt Kinetics CK-Pro Urg Stripped Upper CK Green 11.8 Handguard

Noveske N4 Carry Handle Stripped Upper Receiver Black

Noveske AR-15 N4 Shorty Upper Reciever Assembly 5.56x45mm 10.5" Barrel NSR-9.75 M-LOK Handguard Black

Noveske AR-15 Chainsaw Complete Upper Receiver 5.56x45mm NATO 10.5" Barrel NSR-9 M-LOK Handguard Black

Noveske N4 Engraved AR-15 Ejection Port Cover Flaming Pig

AERO PRECISION M4E1 Complete Upper w/ Threaded 10.5" 5.56 Barrel, ATLAS S-ONE Handguard | Black

Mk16 Super Duty Complete Upper Receivers 5.56mm - Mk16 16'''' Super Duty Upper Chf Bbl, Ach, Nano Fh/Bcg Odg

Ar-15 Super Duty Nano Complete Upper Receivers 5.56mm - Ar-15 10.3 Super Duty Nano Complete Upper Receiver Ddc

Aim Sports AR Complete Upper Assembly 5.56x45mm NATO 10.50 Barrel

Aim Sports AR-15 Complete Upper Assembly Kit 5.56x45mm NATO 16 Barrel

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

Aero Precision M4E1 Enhanced 10.5 5.56 Barrel Complete Upper Receiver

LMT MRP-L M-Lok 9.25" Carbine Length Upper Receiver

Luth-AR Complete AR-15 Build Kit .223 Rem 16 Barrel

Luth-Ar Rifle Kit LW16 with Fixed Stock 16in Upper 15 KeyMod

JE Machine Ultralight Minimalists Partial Top Rail AR-15 M-LOK Handguard 15"

JE Machine Free Float Clamp On AR-15 M-LOK Quadrail Handguard 15" Black

JE Machine Slim M-LOK AR-15 Handguard 15" Black

JE Machine Versatile M-LOK AR-15 Handguard 7" Black