5.56x45mm NATO Upper Receivers

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Black

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Green

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Purple

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Grey

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Clear

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Blue

Guntec USA AR-15 Upper Receiver Assembly Kit Anodized Gold

Guntec USA AR-15 5.56mm Complete Upper Kit Black

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 12.5 in

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 11.5 in

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 10.5 in

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 10.5 in

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver 16in Black Medium

Lead & Steel Mil-Spec Threaded Stripped Upper Receiver Canopy Green

Lead & Steel Llc JAG16URGFDE Just As Good Upper Receiver 5.56mm 16

Lead & Steel ARC 5.56mm 16in Upper Reciever Group Mid Length 1-8 Twist Earth

Lead & Steel ARC 5.56mm 16in Upper Reciever Group Mid Length 1-8 Twist Olive

Lead & Steel All Rounder Carbine 14.5in Mid Length Monobloc Upper Receiver Group Charcoal

Bastion Bastion, Don't Tread On Me, AR-15 Ejection Port Dust Cover, Black/White Finish, Don't Tread On Me/Gadsden Flag Laser Engraved On open Side Only, Fits Standard 223/556/6.8/6.5 BASEPDC-BW-75DTOM

AR-STONER AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 5" Barrel Pistol Length M-LOK Handguard

Andro Corp Industries AR-15 Complete M-LOK Upper Receiver with Flash Hider Assembly w/Fmark Front Sight Base 5.56 NATO 18.75in 10.3in Barrel Govt

Andro Corp Industries 556 Mlok Upper 16in Flat Dark Earth

APF Armory 5.56 Fury Complete Upper Receiver Armor Black

TacFire AR-15 .223 / 5.56 Unassembled Upper Receiver Kit - 10"