XTS Complete Upper Receiver W/O BCG, AR-15, 223/5.56, 16.5In, 7.5In, Pistol, 1-7 Twist, 1/2X28 Thread, M-LOK, Bird Cage, Black Nitride Finish, XTS-CU-7BK

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, Silver, XTSCUBO10SL

Stag Arms AR-15 A3 Flattop Upper Receiver Assembly, Direct Impingement, Left Hand, Cerakote, FDE, STAG310864

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

Stag Arms AR-10 Tactical Left Hand Upper Receiver, 308 Win, 16in Barrel, TAC-GOV-CMV Profile, 1-10 Twist, 5/8X24 Thread, VG6 Gamma, FDE, STAG10111242

Stag Arms AR-10 Stag 10 Stripped Upper Receiver, .210 DPMS High Profile, Stripped, Cerakote, FDE, STAG300879

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

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

Tiger Rock Complete Upper Receiver, AR, 7.62X39, 10.5in Carbine Length, 1-9.5in Twist W/ 10in M-LOK Handguard, Black, Large, UB762-P10.5-FSSM10

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

Andro Corp Industries AR-15 Complete M-LOK Upper Receiver With Flash Hider Assembly W/Fmark Front Sight Base, 5.56 NATO, 18.75In, 10.3in Barrel, Govt, Carbine Length, 1-7 Twist, 1/2X28 Thread, A2, Anodized, Black, U556103M4F

Stag Arms AR-10 Stag 10 Stripped Upper Receiver, .210 DPMS High Profile, Assembled, Cerakote, FDE, STAG300880

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

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

Aero Precision Anodized Black AR15 Stripped Upper Receiver, Multi-Caliber 7075-T6 Aluminum, Black Anodized, APAR501603C

Aero Precision AR .308 Upper Parts Kit, Black, APRH101237

Battle Arms Development Workhorse Upper Receiver Aluminum Black Anodized Receiver For AR15/M4, WH556-URS

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

Tiger Rock Complete Upper Receiver, AR-15, 5.56 NATO, 16in Mid Length, 1-7 Twist, W/ 16in Keymod Handguard, Black, Large, UB15-FKM16

Guntec USA AR-15 5.56 Complete Upper Receiver Combo Kit, Black, GT-UPPER-KIT

Aero Precision M5 Threaded Assembled Upper Receiver, AR Platform, 22In, High Profile, 1-8 Twist, 5/8X24 Thread, Kodiak Brown, APAR308515AC

ABC RIFLE COMPANY AR-15 7.62x39mm 16in Barrel 15in Lightweight Hybrid M-LOK Handguard Complete Build Upper Receiver, 1-10 Twist, 5/8X24, A2 Style Muzzle Brake, Nitride, FDE, UA762-TCML15-FDE

ABC RIFLE COMPANY AR-15 7.62x39mm 10in Quadrail Handguard Complete Pistol Upper Receiver W/BCG And Charging Handle, Sniper Grey, UA762-BR10-QR10-SG

Timber Creek Enforcer AR Upper Parts Kit, AR-15, Purple, Anodized Aluminum, EUPKPPA

Troy AR-15 A3 Upper Receiver Assembly, 223 Wylde, 16in Barrel W/ 15.125in SOCC-Series Handguard, Black, Mid-Length, SUPG-A3S-16BT-00

Tiger Rock Complete Upper Receiver, AR 9mm 16in Length, 1-10 Twist W/ 15in Super Slim Keymod Handguard, Black, Large, UB9-FSM15-MBR95

TRYBE Defense Complete Upper Receiver, AR-15, 5.56x45mm NATO, 16in 5R Barrel, 1-7 Twist, 15in M-LOK Rail, A2 Flash Hider, BCG And CH, Nitride Black, UPPER16556

Next Level Armament NLX450 AR15 450 Bushmaster 18in Forged Complete Upper Receiver, 16in Carbine Gas, 1-24 Twist, Black, NLX507

Stag Arms AR-10 Long Range Right Hand Upper Receiver, 308 Winchester, 20in Barrel, HBAR-CMV Profile, 1-10 Twist, 5/8X24 Thread, VG6 Gamma, FDE, STAG10102442

Stag Arms AR-10 Long Range Left Hand Upper Receiver, 308 Winchester, 20in Barrel, HBAR-CMV Profile, 1-10 Twist, 5/8X24 Thread, VG6 Gamma, Black, STAG10110942

Moriarti Upper Receiver Stripped, AR-15, .300 Blackout, 10.5 Inch Barrel, Medium Profile, Pistol Length, 1X7 Twist, 5/8X24 Thread, M-LOK Handguard, Mini Shroud, Hardcoat Anodized, Black, MAR-300-10-SHRD