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

ABC RIFLE COMPANY AR-15 7.62x39mm 5in Barrel Custom 5in Top Cut Custom M-LOK Handguard Complete Micro Pistol Upper Receiver W/BCG And Charging Handle, Sniper Grey, UA762B-BR5-TCML5-SG

Aero Precision M4E1 Complete Upper Receiver With Flash Hider, AR-15, 5.56x45mm NATO, 16in Mid Length Barrel, 15in M-LOK Handguard, No BCG/CH, Anodized, Black, APAR640251M7

Guntec USA AR-15 Upper Receiver Assembly Kit, Trap Door Assembly, Cerakote Flat Dark Earth, GT-URK-FDE

OP Exclusive Moriarti AR-15 Upper Receiver, 300 Blackout, 10.5In, Pistol, Medium, M-LOK, 1-7 Twist, 5/8X24 Thread, Diamond Cut Free-Float Handguard, Slanted Muzzle Brake, Sniper Grey MAR-10-300-PENTA

Andro Corp Industries AR-15 Complete M-LOK Upper Receiver With Flash Hider Assembly, .300BLK, 16.5In, 8in Barrel, Medium, Pistol Length, 1-7 Twist, 5/8X24 Thread, A2, Anodized, Black, U3008

TRYBE Defense Magnite AR-15 .223 Wylde 10.5in Complete Upper Receiver, Carbine Length, 1-8, 1/2X28, Black, UPPER105223-V2

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Micro Pistol 5in Barrel Custom 5in Top Cut Custom M-LOK Handguard Complete Upper Receiver W/BCG And Charging Handle, Red, UA300B-BR5-TCML5-RD

ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver W/BCG And Charging Handle, Sniper Grey, UA762-BR5-ML4D-SG

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Pistol 10in Quadrail Handguard Complete Upper Receiver W/BCG And Charging Handle, Olive Drab Green, UA300-BR10-QR10-ODG

Opticsplanet Exclusive Moriarti AR-15/47/9/300 Billet Upper Receiver, Slick Side No Forward Assist, Anodized Black, UPPER-SLICK

Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56Mm, 16 Inch Barrel, Mid-Length Profile, 1-9 Twist, 1/2-28 Thread, A2 Flash Hider W/Gas Block, Black, AR0388B

Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver, Raw, GT-UPPER-9-R

Luth-AR Lo Drag Upper Receiver AR-15, Black, UR-LDU

Presma AR-15 223/5.56 Stripped Upper Receiver W/Square Mark, Black, UPR01

Rock River Arms Completed Upper Receiver, X-1 .308/7.62X51mm, 18 Inch Barrel, 1-10 Twist, 5/8-24 Threat, Free-Float Handguard, Brake, Tan, X308A0700T.V1

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver, Red, UP15-BILLET-MOD-RD

Radian Weapons Model 1 Complete Upper Receiver, .223 Wylde, 10.5 in Barrel, Custom, Carbine Length, 1-8 Twist, 1/2X28 Thread, M-LOK, Deadair Flash Hider, Radian Black, R0023

Rock River Arms Completed Upper Receiver, Mid-Length A4, .308/7.62x51mm NATO, 16 Inch Barrel, 1-10 Twist, 5/8-24 Thread, Mid-Length Handguard, A2 Flash Hider, Black, 308A0375

Andro Corp Industries AR-15 Upper Receiver, Black, URS

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

Aero Precision M4E1 Gen 2 Complete Upper Receiver, 18In, .223 Wylde Fluted Barrel, Atlas S-ONE 15in M-LOK HG, Anodized W/BCG/CH, Black, APAR900003

TRYBE Defense Magnite AR-15 .300 BLK 16in Complete Upper Receiver, Carbine Length, 1-8, 5/8X24, Black, UPPER16300-V2

Tiger Rock Low Profile Upper Receiver, AR-10/LR-308, Anodized Black, Black, Small, 308UP

WMD Guns AR-15 A3/A4 Upper Receiver Forged, W/M4 Feed Ramps, Stripped, Nib-X, Titanium Blue, 1-NIBXUF-Titanium Blue

Aero Precision M4E1-T Complete Upper Receiver, 5.56Mm, 11.5In, Carbine Length, S-One M-LOK Handguard, FDE, APAR712112M29

Aero Precision Complete Upper Receiver, M4E1-T, 14.5In, 5.56 Mid Barrel, 12in M-LOK ATLAS S-ONE Handguard, Flat Dark Earth, APAR700314M5

RISE Armament AR-15 Complete Upper Receiver, 22 ARC, 18 In, Dark Gray, RA-22ARC-CU-GRY-18

Ballistic Advantage Upper Receiver, AR-15, Black, BAPA100049

Grid Defense Complete Upper Receiver, 9mm 9X19 Para, 16 Inch, 4150 Light HBAR Barrel, 1-10 Twist, 14 Inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR9MMFDE

Daniel Defense Upper Receiver With Flash Hider Assembly M4A1 RIII URG, 5.56x45mm NATO, 25 Inch, 14.5 Inch Barrel, M4 Profile, Mid Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, FDE, 23-004-01097-011

Ghost Firearms Vital Complete Upper Receiver, .300 Blackout, 16In, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 11in M-LOK Free Float Hand Guard, A2 Birdcage Flash Hider, Black, GF16V11GFR300

Birchwood Casey AR-15 Upper Receiver Vise Block

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 16in 5.56 Mid, RM15, Anodized Black, APAR712705M7

Aero Precision EPC-9 Enhanced Complete Upper Receiver, 11in 9Mm, em-9.3in Handguard, Anodized Black, APAR620275M86

Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 Inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 Inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE