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

Tacfire Complete Upper Receiver, AR-15, Lower Parts Kit, 5.56Mm, 7.5in Barrel, Pistol Length, 7in M-LOK Handguard, Anodized, Black, PK556-LPK

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

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

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 9mm Upper Receiver, Mil-Spec Charging Handle, 7 Inch M-Lok Handguard, 5.5 Inch Contour 4150 Barrel, 1-10 Twist, 1/2X36 Slim Line Flash Cone, Black, 9MM-KIT-2

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, Anodized Black, APAR502503M64

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

Aero Precision M4E1 Complete Upper Receiver, AR-15, 10.5 in Rifle Length Barrel, 9 in M-LOK Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640222M2

Guntec USA AR-15 9mm Cal Complete Upper Receiver Combo Kit, Black, GT-UPPER-9-KIT

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, 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, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, Anodized Black, APAR502505M3

Aero Precision M4E1 Complete Upper Receiver, AR-15, 10.5 in Rifle Length Barrel, 9 in Quad Rail Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640222Q2

Guntec USA AR Complete .308 Upper Receiver W/O Lower Parts Kit, N.5, 15in M-Lok Handguard, .308 Gen 2 M.L.S. Stock Assembly, Mid-Length, .750 Gas Block, 16in M4 4150 Barrel, 1-10 Twist, 5/8X24 A2 Bird

Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in M-LOK Handguard, No BCH/CH, Anodized, Black, APAR640251M8

Aero Precision M4E1 Complete Upper Receiver, AR-15, 5.56x45mm NATO, 14.5 in Mid Length Barrel, 12 in Quad Rail Handguard, No BCG/CH, Magpul Cerakote, Flat Dark Earth, APAR640232Q5

Guntec USA AR-15 Stripped Billet Upper Receiver 15 in Air Lite Series M-LOK Handguard Combo Set, Anodized Black, GT-UPPER-SET-BLK-15AIRLITE

Aero Precision M4E1 Complete Upper Receiver, AR-15, 10.5 in Rifle Length Barrel, 9 in M-LOK Handguard, No BCH/CH, Anodized, Black, APAR640221M2

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-

Aero Precision AR-15 Complete Upper Receiver, 5.56, Mid-Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, FDE Cerakote, APAR502506M65

Aero Precision M4E1 Upper Receiver, AR-15, 5.56x45mm NATO, 7 in M-LOK Handguard, No BCG/Charging Handle, Magpul Cerakote, Flat Dark Earth, APAR640212M0

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

Aero Precision M4E1 Mid Barrel Complete Upper Receiver W/Flash Hider, AR-15, 5.56x45mm NATO, 16in Mid Length Barrel, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7

Moriarti Complete Upper Receiver, AR-15, 5.56 Nato, 10.5 Inch Barrel, Government Contour, Carbine Length, 1X7 Twist, 1/2X28 Thread, M-LOK Handguard, Mini Shroud, Nitride, Od Green Cerakote, MAR-556-10-SHRD-ODG

Luth-AR Mark 12 Complete Upper Barrel Receiver Assembly, 5.56 Mm, 27In, 18In, Government, Rifle, 1X9, 1/2X28, Picatinny,Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Black, BAA3-M12

OP Exclusive Moriarti AR-15 Upper Receiver Assembly, 5.56x45mm NATO, 10.5In, Carbine, Government, M-LOK, 1-7, 1/2X28, Diamond Cut Free-Float Handgrd, Slanted Muzzle Brake, Sniper Grey MAR-10-556-PENTA

Aero Precision M4E1-T Complete Upper, 14.5in 5.56 Carbine Length BRL, 12in M-LOK AR15 ATLAS R-ONE HG, FDE, APAR700714M32

Moriarti Complete Upper Receiver, AR-15, .300 AAC Blackout, 16 Inch Barrel, Medium Profile, Pistol Length, 1X7 Twist, 5/8X24 Thread, M-LOK Handguard, Triport, Hardcoat Anodized, Black, MAR-300-16-15-TRI

OP Exclusive Moriarti AR-15 Upper Receiver Assembly, 5.56X45mm, 10.5In, Carbine, Government, M-LOK, 1-7, 1/2X28, Diamond Cut Free-Float Handgrd, A2 Flash Hider, Cerakote, Burnt Bronze, MAR-10-556-BB

Aero Precision M4E1 Complete Upper Receiver, AR-15, 5.56x45mm NATO, 14.5 in Mid Length Barrel, 12 in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640231Q5

Tiger Rock Complete Upper Receiver, AR-15, 5.56 NATO, 16in Carbine Length, 1-8 Twist w/10in M-LOK Handguard, Black, Large, UB15-10ML

Luth-AR Complete Upper Receiver Assembly, .223, 26In, 16In, Bull, Carbine, 1X9, 1/2X28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, FTBL-B16

OP Exclusive Moriarti AR-15 Upper Receiver Assembly, 5.56x45mm NATO, 10.5In, Carbine, Government, M-LOK, 1-7 Twist, 1/2X28, Diamond Cut Free-Float Handgrd, Triport Muzzle Brake, Black, MAR-10-556-TRI

XTS Complete Upper Receiver W/O BCG, AR-15, 300 BO, 19.5In, 10.5In, Pistol, 1-8 Twist, 5/8X24 Thread, M-LOK, Bird Cage, Black Nitride Finish, Blue, XTSCUBO10BL