Shop 4,464 Deals on Upper Receivers

Aero Precision Complete Upper Receiver M5E1 24in Barrel 6.5mm Creedmoor Rifle Length 1-8 Twist 416R Stainless Steel EM15 Handguard Anodized Black

Rock River Arms LR-308 Upper Receiver Assembly 6.5 Creedmoor 24" Barrel 17" M-LOK Handguard

Rock River Arms LR-308 Upper Receiver Assembly 308 Winchester, 7.62x51mm NATO 18" Stainless Steel Barrel 17" M-LOK Handguard Black

Rock River Arms AR-15 Mountain Upper Receiver Assembly 223 Remington (Wylde) 10.5" Chrome Moly Barrel 9.5" Handguard Black

Aero Precision M4E1 Complete Upper Receiver AR-15 18 in Rifle Length Barrel 15 in M-LOK Handguard No BCH/CH Magpul Cerakote Flat Dark Earth

Maxim Defense MDX 510 AR-15 Upper Receiver Assembly 300 AAC Blackout 10.3" Barrel Arid

Maxim Defense PDX AR-15 Upper Receiver Assembly 7.62x39mm 5.5" Barrel Arid

Aero Precision RM10.3 M4E1-T Complete Upper w/11.5in 5.56 Barrel Black

Matador Arms MAT-9K Roller Delayed Bufferless Upper Receiver Assembly 9mm Luger 5" Barrel FDE

Matador Arms MAT-9 Roller Delayed Bufferless Upper Receiver Assembly 9mm Luger 7.8" Barrel FDE

Rock River Arms AR-15 Upper Receiver Assembly 5.56x45mm 16" Barrel Mid-Length Gas System A2 Front Sight

Rock River Arms LR-308 Upper Receiver Assembly 308 Winchester 20" Varmint Contour Barrel 17" M-LOK Handguard

Rock River Arms AR-15 A4 Upper Receiver Assembly 450 Bushmaster 20" Chrome Moly Barrel 15" Handguard Black

Rock River Arms AR-15 A4 Upper Receiver Assembly 223 Remington (Wylde) 4.5" Chrome Moly Barrel 4.25" M-LOK Handguard Black

CMMG AR-15 Dissent Mk4 Upper Receiver Assembly 5.56x45mm 16" Barrel

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel Left Hand

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver 16in SS QPQ Mid-Length Barrel 1-8 Twist A2 Flash Hider 15in M-LOK ATLAS R-ONE

Aero Precision M5E1 Complete Upper Reciever .308 18in Rifle Barrel 1-10 Twist 5/8x24 Thread Free-Float Handguard Cerakote FDE

Aero Precision M4E1 Complete Upper .223 Wylde 18in Rifle Length 1/8 EM-15 Gen2 A2 Anodize Black

Maxim Defense MDX 508 AR-15 Upper Receiver Assembly 5.56x45mm 8.5" Barrel Black

Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 12in M-LOK Handguard Anodized Black

Rock River Arms AR-15 Upper Receiver Assembly 5.56x45mm 20" Barrel A2 Front Sight

Rock River Arms AR-15 Upper Receiver Assembly 5.56x45mm 16" Barrel 11" M-LOK Handguard

Maxim Defense MDX 508 AR-15 Upper Receiver Assembly 5.56x45mm 8.5" Barrel Arid