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Browse 5.56x45mm NATO Upper Receivers for sale at the lowest prices online.

Luth-AR A1 Assembled Upper Receiver w/ A1 Rear Sight Base Assembly, Black - UR-01A - Luth-Ar

Luth-AR A1 Assembled Upper Receiver w/ A1 Rear Sight Base Assembly, Black - UR-01A

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

Radical .223 Remington Upper with 16" Barrel, Black - RF00325 - Radical Firearms

Radical .223 Remington Upper with 16" Barrel, Black - RF00325

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

Radical Firearms

Luth-AR A2 Carry Handle Style Stripped Upper Receiver w/A2 Rear Sight Cut, Black - Luth-Ar

Luth-AR A2 Carry Handle Style Stripped Upper Receiver w/A2 Rear Sight Cut, Black

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

Ballistic Advantage Performance Series .223 Rem/5.56 11.3" Carbine Barrel, QPQ - BABL556026F - Ballistic Advantage

Ballistic Advantage Performance Series .223 Rem/5.56 11.3" Carbine Barrel, QPQ - BABL556026F

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

Ballistic Advantage

Spikes Tactical Cold Hammer Forged Barrel 5.56 NATO / .223 Rem 14.5 Barrel - Spikes Tactical

Spikes Tactical Cold Hammer Forged Barrel 5.56 NATO / .223 Rem 14.5 Barrel

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

Spikes Tactical

Daniel Defense 5.56x45mm Upper with 11.5" Barrel, Black - 2312800275047 - Daniel Defense

Daniel Defense 5.56x45mm Upper with 11.5" Barrel, Black - 2312800275047

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

FN 10" SCAR 16S Barrel, 1:7, .223 Remington - 98802 - Fnh

FN 10" SCAR 16S Barrel, 1:7, .223 Remington - 98802

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

Rosco Bloodline 10.5" Barrel, 5.56x45mm - SPBL105556BCGGTCNGB001 - Rosco Manufacturing

Rosco Bloodline 10.5" Barrel, 5.56x45mm - SPBL105556BCGGTCNGB001

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

Rosco Manufacturing

Daniel Defense DDM4V7 5.56x45mm 16" Cold Hammer Forged AR-15 Upper Receiver, Black - 23-128-02339-047 - Daniel Defense

Daniel Defense DDM4V7 5.56x45mm 16" Cold Hammer Forged AR-15 Upper Receiver, Black - 23-128-02339-047

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

Rosco Bloodline 11.5" Barrel, 5.56x45mm - SPBL115556BCGGTCNGB001 - Rosco Manufacturing

Rosco Bloodline 11.5" Barrel, 5.56x45mm - SPBL115556BCGGTCNGB001

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

Rosco Manufacturing

Rosco Manufacturing Bloodline Barrel 556NATO 11.5" Black 1:7 BL-115-M4-556-7-C - Rosco Manufacturing

Rosco Manufacturing Bloodline Barrel 556NATO 11.5" Black 1:7 BL-115-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

Midwest Industries Upper Upper 223 Remington 556NATO 10.5" Black MLOK AR-15 - Midwest Industries

Midwest Industries Upper Upper 223 Remington 556NATO 10.5" Black MLOK AR-15

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

Midwest Industries

SilencerCo SCO15, Stripped Upper Receiver, .223 Remington/556NATO, Black - Silencerco

SilencerCo SCO15, Stripped Upper Receiver, .223 Remington/556NATO, Black

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

Rosco Manufacturing Bloodline Barrel 556NATO 10.5" Black 1:7 BL-105-M4-556-7-C - Rosco Manufacturing

Rosco Manufacturing Bloodline Barrel 556NATO 10.5" Black 1:7 BL-105-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

Geissele Automatics Super Duty Mod 1 16" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Black - 08-548B - Geissele

Geissele Automatics Super Duty Mod 1 16" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Black - 08-548B

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

Rosco Bloodline 12.5" Barrel, 5.56x45mm - SPBL125556BCGGTCNGB001 - Rosco Manufacturing

Rosco Bloodline 12.5" Barrel, 5.56x45mm - SPBL125556BCGGTCNGB001

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

Rosco Manufacturing

Ballistic Advantage Classic Series 10.3" AR-15 Barrel, 5.56x45mm - BABL557103MC - Ballistic Advantage

Ballistic Advantage Classic Series 10.3" AR-15 Barrel, 5.56x45mm - BABL557103MC

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

Ballistic Advantage

Daniel Defense M4A1 14.5" Pinned 5.56x45mm Upper Receiver, FDE - 23-004-13150 - Daniel Defense

Daniel Defense M4A1 14.5" Pinned 5.56x45mm Upper Receiver, FDE - 23-004-13150

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

Geissele Automatics Super Duty Mod 1 14.50" 5.56x45mm Upper 1:7 M-LOK Rail Mid-Length with BCG and CH, Black - 08547B - Geissele

Geissele Automatics Super Duty Mod 1 14.50" 5.56x45mm Upper 1:7 M-LOK Rail Mid-Length with BCG and CH, Black - 08547B

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

Daniel Defense MK18 Flat Dark Earth 5.56 NATO 10.3" Short Barrel Upper Receiver Group 23-004-08013-011 - Daniel Defense

Daniel Defense MK18 Flat Dark Earth 5.56 NATO 10.3" Short Barrel Upper Receiver Group 23-004-08013-011

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

FightLite MCR Dual-Feed 12.50" Upper 5.56x45mm 1:7 Mil-Std 1913 Picatinny Rail, Black - Fightlite

FightLite MCR Dual-Feed 12.50" Upper 5.56x45mm 1:7 Mil-Std 1913 Picatinny Rail, Black

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

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 $445.99

Rock River Arms

Geissele Automatics Super Duty Mod 1 13.9" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Black - 08-546B - Geissele

Geissele Automatics Super Duty Mod 1 13.9" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Black - 08-546B

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

Daniel Defense DDM4V7 Lightweight 16" 5.56 AR-15 Upper, Black - 23-128-02932-047 - Daniel Defense

Daniel Defense DDM4V7 Lightweight 16" 5.56 AR-15 Upper, Black - 23-128-02932-047

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

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