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

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

Ballistic Advantage Performance Series Barrel 556NATO 12.3" Black Gas Block - Ballistic Advantage

Ballistic Advantage Performance Series Barrel 556NATO 12.3" Black Gas Block

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

Ballistic Advantage

Aero Precision M4E1 Threaded 16" Upper 5.56x45mm 1:7 M-LOK Rail Mid-Length, Flat Dark Earth - Aero Precision

Aero Precision M4E1 Threaded 16" Upper 5.56x45mm 1:7 M-LOK Rail 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 24" Bull Barrel Complete Upper Assembly For 223 Rem/556NATO Keymod, Black - FTBL-B24 - Luth-Ar

Luth-AR 24" Bull Barrel Complete Upper Assembly For 223 Rem/556NATO Keymod, Black - FTBL-B24

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

FightLite Raptor Dual Feed Upper 16.25" Fits All MIL-SPEC AR-15, M16, and M4 Lowers, 100 Links Included - RPTR-001 - Fightlite

FightLite Raptor Dual Feed Upper 16.25" Fits All MIL-SPEC AR-15, M16, and M4 Lowers, 100 Links Included - RPTR-001

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 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.

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

FightLite MCR Dual-Feed 16.25" 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.

Daniel Defense M4A1 FSP 14.50" Carbine-Length Upper 5.56x45mm 1:7 Quad Rail with BCG and CH, Flat Dark Earth - Tactical Precision - 2300409376 - Daniel Defense

Daniel Defense M4A1 FSP 14.50" Carbine-Length Upper 5.56x45mm 1:7 Quad Rail with BCG and CH, Flat Dark Earth - Tactical Precision - 2300409376

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

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

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

FightLite MCR Dual-Feed 16.25" 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.

Sons of Liberty Gun Works .223 Remington Upper with 13.7" Barrel, Black - EXO3UPPER13.7556 - Sons Of Liberty Gun Works

Sons of Liberty Gun Works .223 Remington Upper with 13.7" Barrel, Black - EXO3UPPER13.7556

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

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

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

$270.00 $208.99

Spikes Tactical

Sons of Liberty Gun Works L89 V2 5.56 11.50" Upper 5.56x45mm M-LOK Rail, Black - Sons Of Liberty Gun Works

Sons of Liberty Gun Works L89 V2 5.56 11.50" Upper 5.56x45mm M-LOK Rail, 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

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.

Aero Precision AR15 Complete Upper 5.56 / .223 Rem 10.5 Barrel - Aero Precision

Aero Precision AR15 Complete Upper 5.56 / .223 Rem 10.5 Barrel

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

Noveske Commando Barrel Stainless 5.56 NATO / .223 Rem 11.5 Barrel for AR-15 - Noveske

Noveske Commando Barrel Stainless 5.56 NATO / .223 Rem 11.5 Barrel for AR-15

$458.99 $334.55

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.

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

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

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 16" 5.56x45mm Upper 1:7 M-LOK Rail with BCG and CH, Desert Dirt - 08-548S - Geissele

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

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

Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4 - Fortis Manufacturing

Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4

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

Fortis Manufacturing

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.

Sons of Liberty Gun Works M4-L89 5.56x45mm 11.50" - Sons Of Liberty Gun Works

Sons of Liberty Gun Works M4-L89 5.56x45mm 11.50"

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

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

Battle Arms WORKHORSE AR-15 Upper Receiver, 16" Barrel, No BCG or Charging Handle - Battle Arms Development

Battle Arms WORKHORSE AR-15 Upper Receiver, 16" Barrel, No BCG or Charging Handle

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

Battle Arms Development

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