Results for 5.56 NATO Upper Receivers & Conversion Kits

Spike s Tactical Generation 2 Billet Upper 223 Remington 556NATO Mil-Spec Barrel Nut

Geissele AR-15 Super Duty MOD1 Pinned and Welded Complete Upper Receiver 5.56x45mm 13.9" Cold Hammer Forged Barrel M-LOK DDC

Battle Arms AR-15 Workhorse Upper Receiver Assembly without BCG 223 Remington (Wylde) 16" Barrel 15" M-LOK Handguard Black

Battle Arms Workhorse AR-15 Complete Upper Receiver 223 Remington (Wylde) 16" Barrel

HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 16.5" Barrel

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm with Pinned 14.5" Cold Hammer Forged Barrel M-LOK Black

FightLite MCR Dual-Feed 16.25" Upper 5.56x45mm 1:7 Mil-Std 1913 Picatinny Rail, Black

San Tan Tactical STT PILLAR Billet AR-15 Upper Receiver Black

Battle Arms Workhorse 16" Upper .223 Wylde 1:8 Free Float M-LOK Rail Carbine-Length, Black

LanTac Upper Standard Receiver 5.56 NATO / .223 Rem M4 Feed Ramps for AR-15

Spikes Tactical Complete Upper Receiver 5.56 NATO / .223 Rem 16 Barrel

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 16" Cold Hammer Forged Barrel M-LOK DDC

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm with Pinned 14.5" Cold Hammer Forged Barrel M-LOK DDC

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

Black Rain Ordnance Milled Upper Receiver Gen 2 Black

Spike s Tactical 16-inch AR-15 Complete Upper 5.56 NATO M4 LE with 9-inch Rail

Geissele AR-15 Super Duty MOD1 Pinned and Welded Complete Upper Receiver 5.56x45mm 13.9" Cold Hammer Forged Barrel M-LOK Black

FightLite MCR Dual-Feed 16.25" Upper 5.56x45mm 1:7 M-LOK Picatinny Rail, Black

Battle Arms Authority Elite 16" Upper 5.56x45mm Free Float M-LOK Rail, Black

Geissele USASOC URG-I Near Clone AR-15 Complete Upper Receiver 5.56x45mm NATO 14.5" Pinned Barrel

FightLite MCR Dual-Feed 16.25" Upper 5.56x45mm 1:7 Mil-Std 1913 Picatinny Rail, Black

Daniel Defense AR-15 M4A1 FSP Complete Upper Receiver 5.56x45mm 14.5" Pinned Surefire SF3P Flash Hider

Battle Arms Authority Elite 16" Upper 5.56x45mm Free Float M-LOK Rail, Black

Daniel Defense M4A1 AR-15 Complete Upper Recevier 5.56x45mm NATO 14.5" Pinned Barrel