Aero Precision AR15 XL Assembled Upper Receiver, Anodized, Black

Aero Precision M4E1 Complete Upper Receiver, 18In, .223 Wylde Rifle Barrel, EQ-15 HG Gen 2, Cerakote, FDE, APAR640252Q42

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

Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 8In, 1-7 Twist, 5/8X24 Thread, ATLAS R-ONE Handguard, FDE Cerakote, APAR700711M1

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 16in 5.56 Mid, SM15, FDE, APAR712115M7

Aero Precision M4E1 Enhanced No Forward Assist Complete Upper Receiver, 10.5in 5.56 Carbine, EM-9.3, FDE, APAR612276M2

Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 10In, 1-7 Twist, 5/8X24 Thread, ATLAS R-ONE Handguard, Black Anodized, APAR700702M4

CMMG Mkgs Banshee Upper Receiver Group, .40 S&W, 8In, Armor Black, 40B735C-AB

Ncstar VISM AR-10 Upper Receiver Block

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, Flat Dark Earth, UA300B-BR5-TCML5-FDE

Aero Precision M4E1 Assembled Upper Receiver, Thread, M-LOK Handguard, Anodized, Brown, APAR700222AC

Stag Arms AR-10 Stag 10 Upper Receiver, Stripped, .210 DPMS High Profile, Left Hand, Type 3 Hard Coat Anodized, Black, STAG310343