Shop 142 Deals on 5.56×45mm NATO Upper Receivers

Aim Sports 16" Complete Upper Assembly 5.56x45mm 1:8, Black - AR5CUB3

Troy Industries .223 Remington Upper with 16" Barrel, Black - SUPGA3M16BT00

Troy Industries .223 Remington Upper with 16" Barrel, Black - SUPGA4S16BT00

CMMG Resolute 16.10" Upper 5.56x45mm with 1:7 Twist Rate and M-LOK Rail - Mid-Length with Charging Handle - Armor Black - 55BB40BAB

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

Tacfire 10" Complete Upper Assembly 5.56x45mm 1:8, Black - BU-556-10

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

HM Defense 12.50" Classic Upper 5.56x45mm 1:8 M-LOK Rail Mid-Length with BCG and CH, Black - 125MBUP556

Bushmaster 16" Classic Upper .223 Remington/5.56x45mm with 1:8 Twist Rate and M-LOK- Carbine-Length with BCG and CH- Black - 00-40011-BLK

HM Defense MonoBloc 9.5" AR-Style Upper Receiver 5.56x45mm/.223 Remington - 95MBUP556

HM Defense .223 Remington Upper with 16" Barrel, Black - 16MBUP556

HM Defense .223 Remington Upper with 16" Barrel, Black - 16MBUP556L

Complete AR-15 Build Kit - Aim Sports Kit in Sleek Black Finish - AR5CUB5

CMMG Dissent 10.50" Upper 5.56x45mm with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black - 55B8D86AB

Tacfire Build Kit for AR-15 5.56 NATO/223 Remington Unassembled Rifle, Nitride Black - SSRK556LPK

Del-Ton 11.50" Classic Upper 5.56x45mm 1:9 Carbine-Length, Black

Del-Ton M4 Magpul M-LOK Rifle Kit

Del-Ton Pre-Ban 20" Classic Upper 5.56x45mm 1:9 Standard-Length, Black

Q LLC Sugar Weasel .223 Remington Upper with 13" Barrel, Black, Tan - ACCSW55613INUPPER

Patriot Ordnance Factory Minuteman 10.5" Complete Upper 5.56x45mm, Patriot Brown - 1817

Patriot Ordnance Factory P415 Edge 10.5" Upper 5.56x45mm 1:8 M-LOK Rail w/ BCG and CH, ODG - 01988

Larue Stripped Upper Receiver, Black

CMMG Dissent 10.50" Upper 5.56x45mm with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Sniper Gray - 55B8D86SG

Spikes Tactical 16" Upper 5.56x45mm 1:7 Quad Rail Mid-Length with BCG, Black - Enhanced Carbine Upper - STU5035CQ2F