Hunting & Archery Equipment › brownells brn 4 upper receiver

CMMG Mk4 .22LR Banshee Upper Group Receiver 4.5in Tungsten 22B5BD4-TNG

CMMG Mk4 .22LR Banshee Upper Group Receiver 4.5in Tungsten 22B5BD4-TNG. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is built... more

Fostech Lite Upper Complete Upper Receiver Low Mass Nickel Boron Bolt Carrier Group Patriot Brown 6206-PB

Fostech Lite Upper Complete Upper Receiver Low Mass Nickel Boron Bolt Carrier Group Patriot Brown 6206-PB. FosTecH Complete Lite Upper reciever Specifications for Fostech Lite Upper Complete Upper Receiver: Manufacturer: Fostech Condition: New Features... more

FM Products MIKE-45 .45 ACP Complete Upper Receiver Kit 16 inch Barrel Front Charge Black MIKE45U-F1615-4-MMKIT

FM Products MIKE-45 .45 ACP Complete Upper Receiver Kit 16 inch Barrel Front Charge Black MIKE45U-F1615-4-MMKIT. 45 ACP Complete Upper Receiver Kit was made to be the ideal item for any person looking for an outstanding choice.. Established using some... more

Daniel Defense DDM4V7 Pro URG 5.56 1-7 S2W LPG MFR XS Rail 15.0 DD Muzzle Climb Mitigator Gen II BCM Mod 4 CH Upper Receiver Complete 18in

Daniel Defense DDM4V7 Pro URG 5.56 1-7 S2W LPG MFR XS Rail 15.0 DD Muzzle Climb Mitigator Gen II BCM Mod 4 CH Upper Receiver Complete 18in. 56 Upper Receiver to gain a competitive advantage during your multi-gun matches. These AR15 Upper Receivers... more

Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm 4.5 Inch Barrel 1-9 Twist 1/2-28 Thread Free-Float Handguard Vortex Flash Hider Black

Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm 4.5 Inch Barrel 1-9 Twist 1/2-28 Thread Free-Float Handguard Vortex Flash Hider Black. 223/5.56mm Completed Pistol Upper. These AR15 Upper Receivers through the skilled product... more

POF USA Rogue Upper Receiver Assembly Mid Length 11in Handguard 12.5in Barrel 5/8x24 M-LOK Micro B Muzzle Break Patriot Brown 1825

POF USA Rogue Upper Receiver Assembly Mid Length 11in Handguard 12.5in Barrel 5/8x24 M-LOK Micro B Muzzle Break Patriot Brown 1825. 308/6.5 semi auto rifle on the market and to do it without needless lightening cuts. Thanks to its ridiculously light... more

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 10 in M-LOK Radian Brown R0640

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 10 in M-LOK Radian Brown R0640. The matching hand guard includes MLOK mounting points for accessories like lights and lasers and the upper receiver has a Magpul M-LOK compatible design. Every... more

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 15.5 in M-LOK Radian Brown R0619

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 15.5 in M-LOK Radian Brown R0619. The matching hand guard includes MLOK mounting points for accessories like lights and lasers and the upper receiver has a Magpul M-LOK compatible design. Every... more

OpticsPlanet Exclusive Daniel Defense Upper Receiver 14.5 in 1/7 Twist Mil Spec Ceracote Finish Black/Brown DD-CTM-URG-OP

OpticsPlanet Exclusive Daniel Defense Upper Receiver 14.5 in 1/7 Twist Mil Spec Ceracote Finish Black/Brown DD-CTM-URG-OP. 5in barrel. This Daniel Defense upper is an OpticsPlanet Exclusive which means you won't find this exact build and color... more

POF USA Minuteman Upper Receiver 5.56 10.5in Barrel Carbine Length 1-8 Twist 1/2x28 9in Renegade Rail 3-prong Flash Hider Patriot Brown 1817

POF USA Minuteman Upper Receiver 5.56 10.5in Barrel Carbine Length 1-8 Twist 1/2x28 9in Renegade Rail 3-prong Flash Hider Patriot Brown 1817. They took it upon themselves to be trained in various weapons and tactics. We deeply admire their patriotism... more

POF USA Rogue Upper Receiver Assembly Mid Length 11in Handguard 16.5in Barrel 5/8x24 M-LOK Micro B Muzzle Break Patriot Brown 1823

POF USA Rogue Upper Receiver Assembly Mid Length 11in Handguard 16.5in Barrel 5/8x24 M-LOK Micro B Muzzle Break Patriot Brown 1823. 308/6.5 semi auto rifle on the market and to do it without needless lightening cuts. Thanks to its ridiculously light... more

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 8.5 in M-LOK Radian Brown R0647

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 8.5 in M-LOK Radian Brown R0647. The matching hand guard includes MLOK mounting points for accessories like lights and lasers and the upper receiver has a Magpul M-LOK compatible design. Every... more

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 17 in M-LOK Radian Brown R0612

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 17 in M-LOK Radian Brown R0612. The matching hand guard includes MLOK mounting points for accessories like lights and lasers and the upper receiver has a Magpul M-LOK compatible design. Every... more

POF USA Minuteman Upper Receiver 5.56 16.5in Barrel Mid Length 1-8 Twist 1/2x28 14.5in Renegade Rail 3-prong Flash Hider Patriot Brown 1815

POF USA Minuteman Upper Receiver 5.56 16.5in Barrel Mid Length 1-8 Twist 1/2x28 14.5in Renegade Rail 3-prong Flash Hider Patriot Brown 1815. They took it upon themselves to be trained in various weapons and tactics. We deeply admire their patriotism... more

POF USA Rogue Upper Receiver Assembly Rifle Length 14in Handguard 20in Barrel 5/8x24 M-LOK Micro B Muzzle Break Patriot Brown 1827

POF USA Rogue Upper Receiver Assembly Rifle Length 14in Handguard 20in Barrel 5/8x24 M-LOK Micro B Muzzle Break Patriot Brown 1827. 308/6.5 semi auto rifle on the market and to do it without needless lightening cuts. Thanks to its ridiculously light... more

Aero Precision Complete Upper Receiver M5 .308 Winchester 20in Heavy Rifle Length 1 in 10 5/8 x 24 15in A2 Flash Hider Anodized Kodiak Brown

Aero Precision Complete Upper Receiver M5 .308 Winchester 20in Heavy Rifle Length 1 in 10 5/8 x 24 15in A2 Flash Hider Anodized Kodiak Brown. Our proprietary ATLAS attachment system is a durable and dependable mounting platform maintaining a slim... more

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Tungsten 22B83CC-TNG

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Tungsten 22B83CC-TNG. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is built... more

CMMG Mk4 Banshee Upper Receiver Group .22 Long Rifle 4.5in Armor Black 22B5BD4-AB

CMMG Mk4 Banshee Upper Receiver Group .22 Long Rifle 4.5in Armor Black 22B5BD4-AB. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper... more

CMMG Mk4 4.6X30mm Banshee Upper Group Receiver 8in Coyote Tan 46B965A-CT

CMMG Mk4 4.6X30mm Banshee Upper Group Receiver 8in Coyote Tan 46B965A-CT. 6x30mm firearm to the U.S. civilian market continuing a tradition of innovation shooters everywhere can now build a light recoiling flat shooting PDW (personal defense weapon)... more

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Coyote Tan 22B83CC-CT

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Coyote Tan 22B83CC-CT. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is... more

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Sniper Grey 22B83CC-SG

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Sniper Grey 22B83CC-SG. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is... more

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Charcoal Green 22B83CC-CG

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Charcoal Green 22B83CC-CG. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is... more

CMMG Mk4 4.6X30mm Banshee Upper Group Receiver 8in Tungsten 46B965A-TNG

CMMG Mk4 4.6X30mm Banshee Upper Group Receiver 8in Tungsten 46B965A-TNG. 6x30mm firearm to the U.S. civilian market continuing a tradition of innovation shooters everywhere can now build a light recoiling flat shooting PDW (personal defense weapon)... more

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Midnight Bronze 22B83CC-MB

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Midnight Bronze 22B83CC-MB. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is... more

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Titanium 22B83CC-TI

CMMG Mk4 .22LR Resolute Upper Group Receiver 17in Titanium 22B83CC-TI. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group is built... more

Rock River Arms Completed Upper Receiver A4 9MM Luger 4.5 Inch Barrel 1-10 Twist 1/2-36 Thread Free-Float Handguard Vortex Flash Hider Black 9MM0368

Rock River Arms Completed Upper Receiver A4 9MM Luger 4.5 Inch Barrel 1-10 Twist 1/2-36 Thread Free-Float Handguard Vortex Flash Hider Black 9MM0368. . Formulated working with several of the very most robust and dependable materials available these... more

Aero Precision M5 Threaded Assembled Upper Receiver AR Platform 22in High Profile 1-8 Twist 5/8x24 Thread Kodiak Brown APAR308515AC

Aero Precision M5 Threaded Assembled Upper Receiver AR Platform 22in High Profile 1-8 Twist 5/8x24 Thread Kodiak Brown APAR308515AC. 308 Winchester Gun Make: AR Platform Condition: New Features of Aero Precision M5 Threaded Assembled Upper Receiver M4... more

Unique-ARs Original Freedom Complete Upper Receiver Cerakote Armor Black/Anodize Black ofreedomcu

Unique-ARs Original Freedom Complete Upper Receiver Cerakote Armor Black/Anodize Black ofreedomcu. When this item is backordered please allow 3-4 weeks for production. Specifications for Unique-ARs Original Freedom Complete Upper Receiver:... more

Unique-ARs Slim Hex Complete Upper Receiver Cerakote Armor Black/Anodize Black shexcu

Unique-ARs Slim Hex Complete Upper Receiver Cerakote Armor Black/Anodize Black shexcu. When this item is backordered please allow 3-4 weeks for production. Specifications for Unique-ARs Slim Hex Complete Upper Receiver: Manufacturer: Unique-ARs... more

Angstadt Arms Complete Upper Assembly AR-15 4 in Handguard 4.5 in Barrel 3-Lug Muzzle Brake Picatinny/M-LOK 1/2x36 Black AAUT109045

Angstadt Arms Complete Upper Assembly AR-15 4 in Handguard 4.5 in Barrel 3-Lug Muzzle Brake Picatinny/M-LOK 1/2x36 Black AAUT109045. Ready to run with any 9MM AR-15 dedicated lower receiver. Specifications for Angstadt Arms AR-15 Complete 9mm Upper... more

Unique-ARs Slim Lotus Complete Upper Receiver Cerakote Armor Black/Anodize Black slotuscu

Unique-ARs Slim Lotus Complete Upper Receiver Cerakote Armor Black/Anodize Black slotuscu. The handguard is our 15? Slim Lotus Dragon. When this item is backordered please allow 3-4 weeks for production. Specifications for Unique-ARs Slim Lotus... more

Unique-ARs Slim Molon Labe Complete Upper Receiver Cerakote Armor Black/Anodize Black smoloncu

Unique-ARs Slim Molon Labe Complete Upper Receiver Cerakote Armor Black/Anodize Black smoloncu. This complete upper features our 15? Slim Molon Labe handguard. When this item is backordered please allow 3-4 weeks for production. Specifications for... more

CMMG Mk4 Banshee Upper Receiver Group .22 Long Rifle 9in Armor Black 22B8F8B-AB

CMMG Mk4 Banshee Upper Receiver Group .22 Long Rifle 9in Armor Black 22B8F8B-AB. 22 LR that looks like an AR build an AR that happens to be chambered in .22 LR. Equipped with a 4.5 barrel the shortest CMMG offers in any caliber this BANSHEE upper group... more

Unique-ARs Original Wicked Wings Complete Upper Receiver Cerakote Armor Black/Anodize Black owickedcu

Unique-ARs Original Wicked Wings Complete Upper Receiver Cerakote Armor Black/Anodize Black owickedcu. When this item is backordered please allow 3-4 weeks for production. Specifications for Unique-ARs Original Wicked Wings Complete Upper Receiver:... more

Aero Precision EPC-9 Threaded Complete Upper Receiver 5.5in 9mm w/ ATLAS R-ONE 4.8in Handguard Anodized Black APAR620708M84

Aero Precision EPC-9 Threaded Complete Upper Receiver 5.5in 9mm w/ ATLAS R-ONE 4.8in Handguard Anodized Black APAR620708M84. The R-ONE handguards are designed with size and weight in mind while still providing plenty of real-estate to accommodate any... more

Tiger Rock Complete Upper Receiver AR 9mm 4.5in Pistol Length 1-10 Twist Super Slim Keymod Handguard Black Nitride Finish Black Large UB9-P4.5-FSM04

Tiger Rock Complete Upper Receiver AR 9mm 4.5in Pistol Length 1-10 Twist Super Slim Keymod Handguard Black Nitride Finish Black Large UB9-P4.5-FSM04. 5in Pistol Length AR-9mm w/ 4in Super Slim Keymod Hanguard Complete Upper Receiver was developed to... more

Rock River Arms A2 National Match Upper Receiver Assembly with National Match 1/4x1/4 .030 Hooded Aperture Rear Sight Black AR0052ANMASY4

Rock River Arms A2 National Match Upper Receiver Assembly with National Match 1/4x1/4 .030 Hooded Aperture Rear Sight Black AR0052ANMASY4. 030 Hooded Aperture Rear Sight. Established working with some of the most extremely sturdy and dependable... more

Rock River Arms A2 National Match Upper Receiver Assembly with National Match 1/4x1/4 .040 Hooded Aperture Rear Sight Black AR0052ANMASY3

Rock River Arms A2 National Match Upper Receiver Assembly with National Match 1/4x1/4 .040 Hooded Aperture Rear Sight Black AR0052ANMASY3. 040 Hooded Aperture Rear Sight was created to function as the best item for any person in need of a high quality... more