Shop 142 Deals on 5.56x45mm NATO Upper Receivers

Tacfire Complete Pistol Build Kit for Semi-Auto Pistols, Black - SS-PK556-LPK

Sons of Liberty Gun Works SOLGW 14.50" Upper 5.56x45mm M-LOK Rail - Tactical Excellence - M4L89BSCHF14.5

VKTR Industries VK-1 5.56x45mm 13.7" 1:7 M-LOK Rail w/ BCG & CH, Flat Dark Earth - V-4027-3410-013-RP

Bushmaster QRC II LTW 16" Classic Upper 5.56x45mm NATO 1:7 Carbine Length, Black

Radian Weapons Model 1 Builder Kit Flat Dark Earth 5.56 8.5 Handguard

Sons of Liberty Gun Works .223 Remington Upper with 13.7" Barrel, Black - M489UPPER13.7556

VKTR Industries VK-1 13.7" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Black - V-4027-3410-012-RP

Sons of Liberty Gun Works Half Complete Upper Receiver M4-89 5.56mm 11.5in 10.5in Combat Barrel M89 Rail A2 Flash Hider No BCG or CH Black

ATI Milsport 7.50" Upper 5.56x45mm 1:8 M-LOK Rail, Black

Aim Sports 10" Complete Upper Assembly 5.56x45mm 1:8, Black - AR5CUB8

Complete AR-15 Pistol Build - Aim Sports Kit in Sleek Black Finish - AR5CUB9

CMMG Resolute 16.10" Upper 5.56x45mm with 1:7 Twist Rate and M-LOK Rail - Mid-Length with Charging Handle - Midnight Bronze - 55BB40BMB

Mcr Belt-Fed Upper Receiver Full Auto - Mcr Belt-Fed Upper Receiver Auto 16.25'''' 1913

Lead & Steel Just As Good 18" Upper 5.56x45mm 1:7 Free Float M-LOK Mid-Length, OD Green

Sons of Liberty Gun Works Half Complete Upper Receiver M4-EXO3 5.56mm 11.5in 10.5in Combat Barrel EXO3 Rail A2 Flash Hider No BCG or CH Black

Sons of Liberty Gun Works .223 Remington Upper with 13.7" Barrel, Black - PATROLSLUPPER13.7556

PSA AK-102 Side Folding Barrel Assembly - Furniture Ready

PSA AK-101 AKM Fixed Barreled Receiver - Furniture Ready Kit

PSA AK-101 Barrel Assembly - Furniture Ready

PSA AK-101 Side Folding Barrel Assembly - Furniture Ready

Ar-15 M16 A1 Upper Receiver - Brn-16a1 M16a1 Upper Receiver Black

Mk18 Stripped Socom Upper Receiver W/ Handguard Only - Mk18 Stripped Socom Upper Receiver