Ncstar VISM AR-10 Upper Receiver Block

Aero Precision AR15 XL Assembled Upper Receiver, Anodized, Black

Aero Precision AR15 Assembled Upper Receiver, Flat Dark Earth, APAR501801AC

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

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

Luth-AR A3 Upper Receiver, Assembled, Black, FTT-EA1

Rainier Arms Rellim Arms AR-15 Take Down Upper Receiver Assembly Combo, Black, RA-TDURA-COMBO

Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 8In, 1-7 Twist, 5/8X24 Thread, ATLAS R-ONE Handguard, Black Anodized, APAR700701M1

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 18In, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M42

AR57 ULT Upper Receiver Assembly, 5.7X28mm, 18In, 16in Barrel, 1/2X28 Thread, AR57-ULT16

Dark Storm Industries DS-15, AR-15, 5.56x45mm NATO, Upper And Lower Receiver Parts Builder Box For DS-15 Featureless MOE Rifle, Non Threaded, Anodized Black, DSI-DS15-MOE-BBN5-BLK

CMMG Upper Group Resolute Mk4 5.56x45mm 14.5in P&W Upper Receiver, No BCG Or CH, AR-15, Black, 55B360B-AB

Lantac USA LLC SF 15 Patrol, Complete Upper Receiver, 300 Blackout, 14.5 Barrel, Fits AR-15, Anodized Finish, Black 01-FA-300-PATROL-UPR

FM Products FM-9 AR 9mm Rear Charging Upper Receiver, 16 Inch, Black, FM9-RS-1615

Midwest Industries Upper Receiver Rod, For AR10, .308 Barrels, Black, MI-308-URR

Lantac USA LLC Urban Tactical, Complete Upper Receiver, 300 Blackout, 11.5 Barrel, Fits AR-15, Anodized Finish, Black 01-FA-300-UTP-UPR

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

Aero Precision M5E1 .308 Enhanced Upper Receiver,Anodized, Black, APAR308504AC

Lantac USA LLC SF 15 Patrol, Complete Upper Receiver, 223 Wylde, 14.5 Barrel, Fits AR-15, Anodized Finish, Black 01-FA-223-PATROL-UPR

Aero Precision EPC-9 - 9/40 Threaded Assembled Upper Receiver W/ LRBHO, Anodized Black, APAR620201AC

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 10,5In, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700712M2

Rock River Arms Forged A2 Stripped Upper Receiver, Black, AR0052A

Rock River Arms Forged A2 Upper Receiver Assembly, Black, AR0052AASY

FM Products FM-9 AR 9x19mm Parabellum Rear Charging Upper Receiver, 5in Barrel, 4in Handguard W/ Blast Diffuser, Black, FM9-RS-54

Ncstar AR-10 Upper Receiver Block - Blue Anodized Aluminum For Assembly And Maintenance, VTHAR10UVB

Aero Precision M5 .308 Assembled Upper Receiver, Flat Dark Earth, APAR308505A

Aero Precision MOD4 15 18 Inch 223 Wylde PROOF 5.56x45mm M4E1-T Complete Upper Receiver, OD Green, APAR700011D111

FM Products FM-9 AR 9x19mm Parabellum Rear Charging Upper Receiver, 5in Barrel, 5in Handguard W/ Blast Diffuser, Black, FM9U-R55-B