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

Guntec USA AR-15 Complete 9mm Upper Receiver, Mil-Spec Charging Handle, 4 Inch M-Lok Handguard, 5.5 Inch Contour 4150 Barrel, 1-10 Twist, 1/2X36 Mini Socom Muzzle Device, Black, 9MM-KIT-4

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

Guntec USA AR-15 Ultralight Series Furniture Set, 5.56 Upper Receiver, 12in Rifle Length M-Lok Handguard, Fixed Stock/Buffer Assembly, Pistol Grip, Anodized Purple, 12MLK-SET-UPPER-PURPLE

Guntec USA AR-15 Upper Receiver Assembly Kit, Gold Plated, GT-URK-G3-GP

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

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

Tiger Rock AR-15 Complete Upper Receiver, 5.56Mm, 24In, 16in Barrel, M4, Carbine, 1X8 Twist, 1/2X28 Thread, Quad Rail, 15in M-Lok Handguard, Brake, Nitride, Anodized, Black, UB15-15ML

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

Ghost Firearms Elite Complete Upper Receiver, 5.56X45 NATO, 10.5 Inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 9 Inch M-LOK Free Float Hand Guard, A2 Flash Hider, Blue Titanium, GF105E9GFR556BT

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

Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in Quad Rail Handguard, No BCH/CH, Anodized, Black, APAR640251Q8

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

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

Luth-AR Complete Upper Receiver Assembly, .223, 29In, 20In, Bull, Rifle, 1X9, 1/2X28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, FTBL-B20

Outerwild AR15 Complete Premium Upper Receiver Billet, .223 Wylde, 16In, 1-7 Twist, 15in M-LOK Handguard, Black Anodize, 4027-3410-025-O

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

ABC RIFLE COMPANY AR-15 .223 remington/5.56x45mm NATO Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver W/BCG And Charging Handle, Robbin's Egg Blue, UA15-BR5-ML4D-RB

Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver, M4, Carbine, 1-7, 1/2X28, Flash Hider, Black Nitride, ODG, UAFC4021556CM41617MHF15ODGSR

Stag Arms AR-15 Tactical Left Hand Upper Receiver, 5.56 NATO, 16in Barrel, Hanson Profile, 1-7 Twist, 1/2 X 28 Thread, VG6 Delta, Nitride, Black, STAG15110142

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 Gamma, Black, STAG15100144

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

Aero Precision AR15 Assembled Upper Receiver, Anodized Black, APAR501603AC

Rock River Arms Completed Upper Receiver, A4 .223/5.56Mm, 10.5 Inch Barrel, 1-7 Twist, 1/2-28 Thread, R4 Handguard, A2 Flash Hide, Black, AR0364B

Aero Precision M4E1-T PRO CHF, M4, 5.56Mm, 11.5 Inch Complete Upper Receiver, Hanson, Carbine Length, 1-7 Twist, A2 Birdcage, Anodized, Black, APAR700005D113

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-

Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver, M4 Barrel, Carbine Length, 1-8 Twist, 1/2X28, Flash Hider, Parkerized, FDE, UAFC-4037-556CM41618-15FDESR

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

Rock River Arms Completed Upper Receiver, A4, .450 Bushmaster, 16 Inch Barrel, 1-24 Twist, 5/8-32 Thread ,Free-Float Handguard, Brake, Black, 450B0592

Moriarti Complete Upper Receiver, AR-9, 9Mm, 4.5 Inch Barrel, Straight Profile, 1-10 Twist, 1/2X36 Thread, M-LOK Handguard, Multiport, Anodized Black, Black, MAR-9MM-4-DMD-CH-BLK

Stag Arms AR-10 Stag 10 Upper Receiver, Assembly, .210 DPMS High Profile, Left Hand, Cerakote, FDE, STAG310880

Dark Storm Industries DS-15, AR-15, 5.56x45mm NATO, 12.5 Inch, Upper Receiver, SOCOM Profile, Carbine Length, 1-7 Twist, Firestorm Compensator, Magpul MVG Black, DSI-UC5-TYP-12T5-BLK

ABC RIFLE COMPANY AR-15 .223 remington/5.56x45mm NATO Pistol 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver W/BCG And Charging Handle, Sniper Grey, UA15-BR7-TCABC7-SG

ABC RIFLE COMPANY AR-15 .223 remington/5.56x45mm NATO Pistol 10in Quadrail Handguard Complete Upper Receiver W/BCG And Charging Handle, Sniper Grey, UA15-BR10-QR10-SG

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver W/BCG And Charging Handle, White, UA300-BR5-ML4D-STW

DEMO, OP Exclusive Moriarti AR-15 Pencil Upper Receiver Assembly, 5.56x45mm NATO, 16In, Mid, M-LOK, 1-7 Twist, 1/2X28 Thread, Diamond Cut Free-Float Handgrd, Tri Port Muzzle Brake, Black, MAR-5.56-16-12-TRI