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 AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, Anodized Black, APAR502503M3

Tacfire AR-15 Upper Receiver Vise Block Black

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

Aero Precision AR-15 Complete Upper Receiver, 5.56, Mid-Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, Anodized Black, APAR502505M65

Guntec USA AR-15 Stripped Billet Upper Receiver w/15in Ultralight Series M-Lok Handguard, Anodized Purple, GT-UPPER-SET-PURPLE-15MLK

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, FDE Cerakote, APAR502504M64

Aero Precision Upper Receiver Assembled, AR-15, M-LOK Handguard, Ceracote, Sniper Grey, APAR501812AC

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

Aero Precision AR-15 Assembled Upper Receiver, OD Green, APAR501663AC

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

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

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

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

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, Purple, XTSCUBO10PP

Aero Precision AR-15 Assembled Upper Receiver, Kodiak Brown, APAR501664AC

AIM Sports Inc Complete AR Pistol Upper Receiver W/ BCG, 5.56 NATO, 10.5in Barrel, M4 Profile, Carbine, 1-8 Twist, 1/2X28 Thread, 10M-LOK Free Float Handguard, A2 Birdcage Flash Hider, Nitride, Black, AR5CUB8

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

Guntec USA AR .308 Stripped Billet Upper Receiver w/15in Ultralight Series M-Lok Handguard, Flat Dark Earth, GT-UPPER-SET-FDE-15MLK-308

Guntec USA AR-15 Stripped Billet Upper Receiver w/12in Ultralight Series M-Lok Handguard, Purple, GT-UPPER-SET-PURPLE-12MLK

Rock River Arms Completed Upper Receiver, Elite Carbine A4 .223/5.56Mm, 16 Inch Barrel, 1-9 Twist, Mid-Length Profile, 1/2-28 Thread, A2 Flash Hider, Black, AR0831B

ABC RIFLE COMPANY AR-15 7.62x39mm M-LOK Handguard Complete Pistol Upper Receiver W/BCG And Charging Handle, 1-10 Twist, 5/8X24, A2 Style Muzzle Brake, Nitride, Bronze, UA762-BR7.5-ML7D-BB

Moriarti Upper Receiver With Flash Hider, AR-15, 5.56 Nato, 10.5 Inch Barrel, Government Contour, Carbine Length, 1X7 Twist, 1/2X28 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black, MAR-556-10-A2

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

ABC RIFLE COMPANY AR-15 7.62x39mm M-LOK Handguard Complete Pistol Upper Receiver W/BCG And Charging Handle, 1-10 Twist, 5/8X24, A2 Style Muzzle Brake, Nitride, Olive Drab Green, UA762-BR7.5-ML7D-ODG

Rock River Arms Completed Upper Receiver, Coyote Rifle .223 Wylde, 20 Inch Barrel, 1-9 Twist, 1/2-28 Thread, Free-Float Handguard, Vortex Flash Hider, Black, AR0587

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

Guntec USA AR-15 Stripped Billet Upper Receiver 15 in Air Lite Series Honeycomb M-LOK Handguard Combo Set, Anodized Gold, GT-UPPER-SET-GOLD-HC

Tacfire Stripped AR-15 5.56x45mm NATO Upper Receiver, Black Anodized, UP01C2

ABC RIFLE COMPANY AR-15 .223 5.56 Complete Build 16in Barrel 15in Lightweight Hybrid M-LOK Handguard Upper Receiver, 1-10 Twist, 1/2X28, A2 Style Muzzle Brake, Nitride, Black, UA15-TCML15-BLK

Aero Precision M4E1 Complete Upper Receiver, AR-15, 5.56x45mm NATO, 14.5 in Mid Length Barrel, 12 in M-LOK Handguard, No BCG/CH, Magpul Cerakote, Flat Dark Earth, APAR640232M5

Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver, M4, Carbine, 1-7, 1/2X28, Flash Hider, Black Nitride, FDE, UAFC4022556CM41617MHF15FDESR

Guntec USA AR-15 Stripped Billet Upper Receiver 15 in Air Lite Series Honeycomb M-LOK Handguard Combo Set, Anodized Purple, GT-UPPER-SET-PURPLE-15HC

Guntec USA AR-15 Stripped Billet Upper Receiver 15 in Air Lite Series M-LOK Handguard Combo Set, Anodized Purple, GT-UP-SET-PURPLE-15AIRLITE

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

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Pistol M-LOK Handguard Complete Upper Receiver W/BCG And Charging Handle, Sniper Grey, UA300-BR7.5-ML7D-SG