Aero Precision AR15 Complete Upper Receiver, 16in 5.56 Mid-Length Barrel W/ Pinned Front Sight Base, M4 Handguard, Black, APAR505631

Aero Precision AR15 Complete Upper, 16in 5.56 Mid-Length Barrel W/ Pinned FSB, M4 Handguard ,Includes BCG & CH, Anodized Black, APAR505731

Aero Precision AR15 Complete Upper, 16in 5.56 M4 Carbine Barrel W/ Pinned FSB, M4 Handguard ,Includes BCG & CH, Anodized Black, APAR505721

Aero Precision AR15 Complete Upper Receiver, 16in 5.56 Carbine Barrel W/ Pinned Front Sight Base, M4 Handguard, Black, APAR505621

Aero Precision AR-15 Complete Upper Receiver, 5.56, Rifle Length, 20 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, FDE Cerakote, APAR502502M66

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, Anodized Black, APAR502505M3

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, FDE Cerakote, APAR502506M3

Aero Precision AR-15 Complete Upper Receiver, 5.56, Rifle Length, 20 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, Anodized Black, APAR502501M66

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, FDE Cerakote, APAR502506M64

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, FDE Cerakote, APAR502504M3

American Built Arms Company 5.56mm AR Essentials Kit, Silver/Black, Small ABAAREK

Tacfire A2 AR-15/5.56 Complete Stock Kit, Polymer, Black, MAR123

Aero Precision Complete Upper Receiver, M4E1-T, 18In, 5.56 Rifle Length Barrel, 15in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700315M8

Stag Arms AR-15 Retro Left Hand Upper Receiver, 5.56 NATO, 20in Barrel, NJ Compliant, GOV Profile, 1-7 Twist, 1/2 X 28 Thread, Compensator, Black, STAG15111013

Stag Arms AR-15 Tactical Right Hand Upper Receiver, 5.56 NATO, 16in Barrel, Hanson Profile, 1-7 Twist, 1/2 X 28 Thread, VG6 Delta, FDE, STAG15100242

Tacfire AR-15 5.56/.233/.300AAC Stripped Upper Receiver W/M4 Feed Ramps, Black, UP01

Stag Arms AR-15 Retro Right Hand Upper Receiver, 5.56 NATO, 20in Barrel, NJ Compliant, 1-7 Twist, 1/2 X 28 Thread, Compensator, Black, STAG15101013

TRYBE Defense AR-15 5.56 Complete Bolt Carrier Group BCG, High-Polished Gold Titanium Nitride, BCG556-GLD

Stag Arms AR-15 Tactical Right Hand Upper Receiver, 5.56 NATO, 16in Barrel, Hanson Profile, 1-7 Twist, 1/2 X 28 Thread, VG6 Delta, Black, STAG15100142

Aero Precision AR15 5.56mm Bolt Carrier Group, Phosphate, Black, APRH100019

Guntec USA AR-15 5.56 Upper Receiver W/O Lower Parts kit,n.2,15in Ultralight M-LOK Handguard,MLS Gen 2 Stock Assembly,Carbine ,.750 Gas block,16in 5.56mm M4 4150 Barrel,1-7 Twist, FDE, AR556-KIT-2

Stag Arms AR-15 Upper Right Hand Receiver, 5.56 NATO, 16in Barrel, NJ Compliant, M4 Profile, 1-7 Twist, 1/2 X 28 Thread, Compensator, Black, STAG15101113

Guntec USA AR-15 Complete 5.56 Upper Receiver W/O Lower Parts Kit, N.4, 15in Air-Lok M-Lok Handguard, MLS Gen 2 Stock Assembly, Carbine Length, .750 Gas Block, 16in 5.56mm M4 4150 Barrel, 1-7 Twist, 1

Guntec USA AR-15 Complete 5.56 Upper Receiver W/O Lower Parts Kit, N.3, 15in Air-Lok M-Lok Handguard, MLS Gen 2 Stock Assembly, Carbine Length, .750 Gas Block, 16in 5.56mm M4 4150 Barrel, 1-7 Twist, 1

Guntec USA AR-15 Complete 5.56 Upper Receiver W/O Lower Parts Kit, N.6, 15in Air-Lok M-Lok Handguard, MLS Gen 2 Stock Assembly, Carbine Length, .750 Gas Block, 16in 5.56mm M4 4150 Barrel, 1-7 Twist, 1

Stag Arms AR-15 3-Gun Elite Right Handupper Receiver, 5.56 NATO, 18in Barrel, NJ Compliant, Heavy-Fluted Profile, 1-8 Twist, VG6 Gamma, Black, STAG15100613

Guntec USA AR-15 Complete 5.56 Upper Receiver W/O Lower Parts Kit, N.1, 15in Ultralight M-Lok Handguard, MLS Gen 2 Stock Assembly, Carbine Length, .750 Gas Block, 16in 5.56mm M4 4150 Barrel, 1-7 Twist

Guntec USA AR-15 Complete 5.56 Upper Receiver W/O Lower Parts Kit, N.5, 15in Ultralight Series M-Lok Handguard, MLS Gen 2 Stock Assembly, Carbine Length, .750 Gas Block, 16in 5.56mm M4 4150 Barrel, 1-

Stag Arms AR-15 Tactical Right Hand Upper Receiver, 5.56 NATO, 7.5in Barrel, GOV-CMV Profile, 1-7 Twist, 1/2 X 28 Thread, VG6 Delta, Chromephos, FDE, STAG15101921

Stag Arms AR-15 3-Gun Elite Left Handupper Receiver, 5.56 NATO, 18in Barrel, NJ Compliant, Heavy-Fluted Profile, 1-8 Twist, VG6 Gamma, Black, STAG15110613

Tiger Rock Complete Upper Receiver, AR-15, 5.56 NATO, 7in Pistol Length, 1-8 Twist, W/ 7in Super Slim M-LOK Handguard, Black, Large, UB15-P7-FSSM07

Stag Arms AR-15 Tactical Right Hand Upper Receiver, 5.56 NATO, 7.5in Barrel, GOV-CMV Profile, 1-7 Twist, 1/2 X 28 Thread, VG6 Delta, Nitride, FDE, STAG15101922

Andro Corp Industries AR-15 Complete M-LOK Upper Receiver With Flash Hider Assembly, 5.56 NATO, 18.75In, 10.3in Barrel, Govt, Carbine Length, 1-7 Twist, 1/2X28 Thread, A2, Anodized, Black, U556103ML

Rainier Arms AR-15 5.56/.223 Precision Match Grade BCG, Black Nitride, Small, RA-PMG-BCG-NITRIDE

Luth-AR MBA-5 Stock Assembly, AR-10/ AR-15, 9Mm/5.56X45mm/.308 Caliber, 11.5 - 14.5 In, Black, MBA-5

XTS Complete Upper Receiver W/O BCG W/ Ce Rail, AR-15, .223/5.56, 16.5In, 7.5in Barrel, Pistol, 1-7 Twist, 1/2X28 Thread, M-LOK, Bird Cage, Black Finish, XTS-CU-7CE