5.56x45mm NATO Upper Receivers

Rock River Arms AR-15 A4 Complete Upper Receiver 223 Wylde 20" Stainless Steel Barrel 15" Handguard with A2 Front Sight Black

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel with Gas Block

ROCK RIVER ARMS LAR-15 A4 Pistol w/ SBA3 Brace

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm 16" Barrel Mid-Length Gas System A2 Front Sight

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm 20" Barrel A2 Front Sight

Rock River Arms AR-15 A2 Complete Upper Receiver 223 Wylde 20" Stainless Steel Barrel 14" Handguard Black

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm 16" Barrel 11" M-LOK Handguard

Rock River Arms AR-15 A4 Complete Upper Receiver 223 Remington (Wylde) 20" Chrome Moly Barrel 14" Handguard Black

Rock River Arms AR-15 A4 Complete Upper Receiver 223 Remington (Wylde) 16" Chrome Moly Barrel M-LOK Handguard Black

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm 16" Barrel A2 Front Sight

Rock River Arms AR-15 Coyote Complete Upper Receiver 223 Remington (Wylde) 16" Chrome Moly Barrel 12.5" M-LOK Handguard Black

Black Diamond Specter Xl Top End - Black Diamond Specter Xl Top End 5.56mm Nato 16'''' Bbl 1-8

NOVESKE CHAINSAW 5.56 NATO 11.5" 30rd - Black

NOVESKE Chainsaw Irregular Defense GEN4 5.56 NATO 11.5" Complete Upper Receiver | FDE

Noveske Upper Complete 4Th Generation N4 5.56 Micro Switchblock 10.5 Light Shorty Chf BLK Cerakote NSR-9.75-Sb (M-LOK) BLK Love Handle Charging Handle Pig Pen Fh 1/2X28

Noveske Upper Complete 4Th Generation N4 5.56 16 Light Recon Chf BLK Cerakote Nhr-15 (M-LOK) BLK Love Handle Charging Handle Pig Pen Fh 1/2X28

Noveske Upper Complete 4Th Generation N4 5.56 14.5 Light Afghan Chf Bazooka Green Cerakote NSR-13.5 (M-LOK) BLK Love Handle Charging Handle Long Pig Pen Fh 1/2X28 (Pinned)

Noveske AR-15 N4 SPR Complete Upper Receiver 5.56x45mm NATO 18" Barrel NSR-15 M-LOK Handguard FDE

Stag Arms Upper Receiver Assembly Kit Left Hand

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel M-LOK Handguard Flat Dark Earth

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel M-LOK Handguard Black

AERO PRECISION M4E1-T Complete Upper 16" 5.56 Gov Mid MOD4 15 KB

Aero Precision M4E1-T Barreled Upper Receiver 5.56x45mm NATO 12.5" Government Contour Barrel 11.4" Mod4 Handguard Olive Drab Green

Aero Precision M4E1-T Barreled Upper Receiver 5.56x45mm NATO 11.5" Government Contour Barrel 10.6" Mod4 Handguard Black