AR Parts in 5.56x45mm NATO

Sniper AR-15 4in Pistol Tubular / Round Forend Handguard 6061-T6 Aluminum .223/5.56 Mid-Length Matte Black

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel M-LOK Handguard Flat Dark Earth

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel M-LOK Handguard Black

AERO PRECISION M4E1-T Complete Upper 16" 5.56 Gov Mid MOD4 15 KB

Aero Precision M4E1-T Barreled Upper Receiver 5.56x45mm NATO 12.5" Government Contour Barrel 11.4" Mod4 Handguard Olive Drab Green

Aero Precision M4E1-T Barreled Upper Receiver 5.56x45mm NATO 11.5" Government Contour Barrel 10.6" Mod4 Handguard Black

Aero Precision M4E1-T Barreled Upper Receiver 5.56x45mm NATO 14.5" Government Contour Barrel 13.5" Mod4 Handguard Black

Ballistic Advantage 16" 5.56 Government Profile Midlength AR-15 Barrel Modern Series w/ FSB Circular Handguard Cap

Aero Precision M4E1-T SM15 Complete Upper 5.56 x 45 16inch HBAR Mid Length 1-7 Twist 1/2 x 28 Thread Cerakote FDE

Aero Precision M4E1-E EQ15 Complete Upper 5.56 x 45 16inch HBAR Mid Length 1-7 Twist 1/2 x 28 Thread Cerakote FDE

Aero Precision M4E1-E EQ15 Complete Upper 5.56 x 45 16inch HBAR Mid Length 1-7 Twist 1/2 x 28 Thread Anodized Black

Aero Precision M4E1-E AR-15 5.56x45mm NATO 13.9in Atlas S-One M-LOK Upper Receiver Government CMV Mid Length 1-7 Twist 1/2x28 A2 Flash Hider 12.7in HG

Aero Precision M4E1-E AR-15 5.56x45mm NATO 13.9in Atlas S-One M-LOK Upper Receiver Government CMV Mid Length 1-7 Twist 1/2x28 A2 Flash Hider 12.7in HG

Aero Precision AR-15 M4E1-T Barreled Upper Receiver 5.56x45mm NATO 16" Barrel Mid-Length OD Green Cerakote

AERO PRECISION M4E1 15" Enhanced M-LOK Complete Upper 5.56 NATO 16" HBAR CMV Barrel - Black

Aero Precision M4E1 5.56 NATO No Forward Assist Threaded Assembled Upper Receiver FDE Cerakote

Aero Precision M4E1 Standard Assembled AR-15 Upper Receiver No Forward Assist Aluminum Black

Aero Precision Complete Upper Receiver M4E1-T 18in 5.56 Rifle Length Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

Aero Precision AR-15 MOD 4 M-LOK Handguard - OD Green, 12.7"

Knight's Armament AR-15 MK18 Carbine Free Float RAS

Sr-15 E3 Mod 2 Upper Receivers M-Lok - Ar-15 Upper Receiver Lpr Mod 2 18'''' Urx

Ballistic Advantage Logic Series Barrel 5.56x45 10.3 inch Hanson Carbine 1-7 Twist 1/2 x 28 Thread Anodized Black

AMERICAN TACTICAL IMPORTS Poly Hybrid Strip Upper Multi Battlefield Green

Mk16 Super Duty Complete Upper Receivers 5.56mm - Mk16 11.5'''' Super Duty Upper Chf Bbl, Ach, Nano Fh/Bcg Odg