Home /Categories / Upper Receivers / 5.56×45mm NATO

Shop 158 Deals on 5.56×45mm NATO Upper Receivers

Browse 5.56×45mm NATO Upper Receivers for sale at the lowest prices online.

Rosco Manufacturing Bloodline Barrel 556NATO 14.5" Black 1:7 BL-145-M4-556-7-C - Rosco Manufacturing

Rosco Manufacturing Bloodline Barrel 556NATO 14.5" Black 1:7 BL-145-M4-556-7-C

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Rosco Manufacturing

Colt EPR 5.56 M-LOK 16" AR-15 Upper, Black - LE6920EPR-CK - Colt

Colt EPR 5.56 M-LOK 16" AR-15 Upper, Black - LE6920EPR-CK

$1,229.99 $881.99

Sons of Liberty Gun Works .223 Remington Upper with 16" Barrel, Black - PATROLSLUPPER16556 - Sons Of Liberty Gun Works

Sons of Liberty Gun Works .223 Remington Upper with 16" Barrel, Black - PATROLSLUPPER16556

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Sons Of Liberty Gun Works

Ballistic Advantage Performance Series 13.9" AR-15 Barrel, 5.56x45mm - BABL556037F - Ballistic Advantage

Ballistic Advantage Performance Series 13.9" AR-15 Barrel, 5.56x45mm - BABL556037F

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Ballistic Advantage

Geissele Automatics Super Duty Mod 1 14.5" Upper 5.56x45mm 1:7 M-LOK Rail Mid-Length with BCG and CH, Desert Dirt - 08547S - Geissele

Geissele Automatics Super Duty Mod 1 14.5" Upper 5.56x45mm 1:7 M-LOK Rail Mid-Length with BCG and CH, Desert Dirt - 08547S

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Faxon Firearms ARAK-21 5.56x45mm 16" Quad Rail w/ BCG & CH, Black - URSSB556 - Faxon Firearms

Faxon Firearms ARAK-21 5.56x45mm 16" Quad Rail w/ BCG & CH, Black - URSSB556

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Battle Arms Development WORKHORSE Upper .223-Remington 5.56-NATO 10.5 Barrel - Battle Arms Development

Battle Arms Development WORKHORSE Upper .223-Remington 5.56-NATO 10.5 Barrel

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Battle Arms Development

Rock River Arms RRAGE 3G 16" Classic Upper 5.56x45mm 1:8 M-LOK Carbine-Length with BCG and CH, Black - High-Performance - BB0470 - Rock River Arms

Rock River Arms RRAGE 3G 16" Classic Upper 5.56x45mm 1:8 M-LOK Carbine-Length with BCG and CH, Black - High-Performance - BB0470

$649.99 $444.99

Rock River Arms

LanTac USA LLC USR, Upper Standard Receiver, 556NATO, AR-15, M4 Feed Ramps, Anodized Black - Lantac

LanTac USA LLC USR, Upper Standard Receiver, 556NATO, AR-15, M4 Feed Ramps, Anodized Black

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Black Rain Ordnance Flat Top Milled Upper Receiver, Black - BRO-MUR-2 - Black Rain Ordnance

Black Rain Ordnance Flat Top Milled Upper Receiver, Black - BRO-MUR-2

$326.99 $186.99

Black Rain Ordnance

Faxon Firearms ARAK-21 12.50" Upper 5.56x45mm, Black - Faxon Firearms

Faxon Firearms ARAK-21 12.50" Upper 5.56x45mm, Black

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Sons of Liberty Gun Works L89 V2 5.56 16" Upper 5.56x45mm 1:7 M-LOK Rail Mid-Length, Black - Sons Of Liberty Gun Works

Sons of Liberty Gun Works L89 V2 5.56 16" Upper 5.56x45mm 1:7 M-LOK Rail Mid-Length, Black

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Sons Of Liberty Gun Works

Maxim Defense PDX 5.56x45mm Upper with 5.5" Barrel, Black - MXM47813 - Maxim Defense

Maxim Defense PDX 5.56x45mm Upper with 5.5" Barrel, Black - MXM47813

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Spikes Tactical 16" Classic Upper 5.56x45mm/.223 Remington 1:7 Quad Rail Mid-Length, Black - Spikes Tactical

Spikes Tactical 16" Classic Upper 5.56x45mm/.223 Remington 1:7 Quad Rail Mid-Length, Black

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Spikes Tactical

Aero Precision AR-15 16" MOE Upper 5.56x45mm 1:7 MOE M-LOK Rail SL Mid-Length, Flat Dark Earth - Aero Precision

Aero Precision AR-15 16" MOE Upper 5.56x45mm 1:7 MOE M-LOK Rail SL Mid-Length, Flat Dark Earth

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Luth-AR 16" Lightweight Barrel Complete Upper Receiver For 223 Rem/556NATO, Black - BAA3-L16 - Luth-Ar

Luth-AR 16" Lightweight Barrel Complete Upper Receiver For 223 Rem/556NATO, Black - BAA3-L16

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

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

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

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Battle Arms Development

Maxim Defense PDX 5.56x45mm Upper with 5.5" Barrel, Flat Dark Earth - MXM47812 - Maxim Defense

Maxim Defense PDX 5.56x45mm Upper with 5.5" Barrel, Flat Dark Earth - MXM47812

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Radian Weapons Model 1 Builder Kit Gray 5.56 14 Handguard - Radian Weapons

Radian Weapons Model 1 Builder Kit Gray 5.56 14 Handguard

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Noveske Light Afghan Barrel 5.56 NATO / .223 Rem 14.5 Barrel for AR-15 - Noveske

Noveske Light Afghan Barrel 5.56 NATO / .223 Rem 14.5 Barrel for AR-15

$655.99 $487.00

Daniel Defense DD4 RIII 16" Upper 5.56x45mm 1:7 M-LOK Mid-Length, Flat Dark Earth - Daniel Defense

Daniel Defense DD4 RIII 16" Upper 5.56x45mm 1:7 M-LOK Mid-Length, Flat Dark Earth

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Daniel Defense AR15 14.5" 5.56 NATO M4A1 RIII URG, FDE - Daniel Defense

Daniel Defense AR15 14.5" 5.56 NATO M4A1 RIII URG, FDE

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Daniel Defense AR15 16" 5.56 NATO DD4 RIII URG - Daniel Defense

Daniel Defense AR15 16" 5.56 NATO DD4 RIII URG

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

Daniel Defense AR15 10.3" 5.56 NATO MK18 RIII URG - Daniel Defense

Daniel Defense AR15 10.3" 5.56 NATO MK18 RIII URG

MAP (Minimum Advertised Price) means this product is for sale at a lower price than what the manufacturer allows advertised.

3 / 7