Hunting & Archery Equipment › brownells brn 4 upper receiver

Aero Precision Complete Upper Receiver M4E1-E 16in .223 Wylde SS Mid Barrel Quantum 12in M-LOK Handguard Flat Dark Earth APAR640114M9

Aero Precision Complete Upper Receiver M4E1-E 16in .223 Wylde SS Mid Barrel Quantum 12in M-LOK Handguard Flat Dark Earth APAR640114M9. Key features include the addition of built in anti-rotation tabs removable 4-slot picatinny rail section for front... more

Angstadt Arms Complete Upper Assembly AR-15 4 in Handguard 4.5 in Barrel A2 Flash Hider Picatinny/M-LOK 1/2x36 Black AAUT009045

Angstadt Arms Complete Upper Assembly AR-15 4 in Handguard 4.5 in Barrel A2 Flash Hider Picatinny/M-LOK 1/2x36 Black AAUT009045. Ready to run with any 9MM AR-15 dedicated lower receiver. Specifications for Angstadt Arms AR-15 Complete 9mm Upper... more

Aero Precision M5E1 Enhanced Stripped Upper Receiver Kodiak Brown APAR308788AC

Aero Precision M5E1 Enhanced Stripped Upper Receiver Kodiak Brown APAR308788AC. . Developed by using some of the very most durable and long lasting resources around these AR15 Upper Receivers through Aero Precision can provide an item which will give... more

Brownells Brn-15 Upper Receivers 5.56mm Nato - Brn-15 16" Upper Receiver Assembly .750" Gas Block 5.

Manufactured in the US with the highest quality components, the BRN-15 Upper Receiver Groups are great starts for your next build. Pick your preferred bolt carrier group and charging handle to complete. The BRN-15 Upper Receiver Groups feature a... more

Brownells Brn-15 Upper Receivers 5.56mm Nato - Brn-15 13.7" Upper Receiver Assembly .750" Gas Block

Manufactured in the US with the highest quality components, the BRN-15 Upper Receiver Groups are great starts for your next build. Pick your preferred bolt carrier group and charging handle to complete. The BRN-15 Upper Receiver Groups feature a... more

Brownells Brn-180s Upper Receivers With Pin & Weld Flash Hider - Brn-180s Gen 2 14.5" Upper Receiver

LIMITED PRODUCTION RUN! Get the Shortest-Possible BRN-180 Without Having To Register It As an SBR This special, limited-production model of our popular BRN-180S complete upper receiver comes with a premium Primary Weapon Systems FRC Rearden flash hider... more

Brownells Brn-180 350 Legend 16in Complete Upper Receiver Assembly - Brn-180 16" Upper Receiver 350

BRN-180 chambered in 350 Legend ready to hunt! Fully self contained Upper Receiver Group, requires no messing with new buffers or recoil springs. Compatible with standard AR-15 lower receivers, easily set your rifle up for hunting season with the... more

Brownells Brn-15 Upper Receivers 5.56mm Nato - Brn-15 11.5" Upper Receiver Assembly .750" Gas Block

Manufactured in the US with the highest quality components, the BRN-15 Upper Receiver Groups are great starts for your next build. Pick your preferred bolt carrier group and charging handle to complete. The BRN-15 Upper Receiver Groups feature a... more

Brownells Brn-16a4 Complete Upper Receiver - Brn 16a4 20" Upper Receiver

The BRN-16A4 features the correct components you're seeking in a M16A4 build. With the classic 20 inch Government profile 5.56x45mm NATO barrel, the BRN-16A4 has an instantly recognizable appearance. The 20 inch barrel has a chrome bore and chamber,... more

Brownells Brn-180s Upper Receivers With Pin & Weld Flash Hider - Brn-180s Gen 2 13.9" Upper Receiver

LIMITED PRODUCTION RUN! Get the Shortest-Possible BRN-180 Without Having To Register It As an SBR This special, limited-production model of our popular BRN-180S complete upper receiver comes with a premium Primary Weapon Systems FRC Rearden flash hider... more

Brownells Brn-773 Upper Receiver - 733 C7 11.5" Upper Receiver

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Brownells Brn 16a2 Upper Receiver - Brn16a2 20" Upper Receiver

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Brownells Bundles Dd 10.3" Mk18 Riii Upper Receiver W/ Eotech Optics - Dd 10.3" Mk18 Riii Upper W/ E

Brownells has paired up the Daniel Defense MK18 RIII AR15 style Upper Receiver Group with your choice of EOTech Red Dot EXPS2-0 or EXPS3-0. Adding to their extremely successful line of stripped MK18 Daniel Defense uppers, Daniel Defense now has the... more

Brownells Bundles Dd 14.5" M4a1 Somcom Upper Receiver W/ Eotech Optic - Dd 14.5" M4a1 Socom Upper W/

Brownells has paired up the Daniel Defense M4A1 SOCOM Block II Upper Receiver with your choice of EOTech Red Dot EXPS2-0 or EXPS3-0. The Daniel Defense M4A1 SOCOM Block II Upper Receiver has been designed for those looking to match the specs and... more

Brownells Bundles Dd 14.5" M4a1 Fsp Upper Receiver W/ Eotech Optics - Dd 14.5" M4a1 Fsp Upper W/ Exp

Brownells has paired up the Daniel Defense M4A1 FSP AR15 style Upper Receiver Group with your choice of EOTech Red Dot EXPS2-0 or EXPS3-0. This Daniel Defense M4A1 FSP AR15 style Upper Receiver Group was built for customers wanting a firearm inspired... more

Brownells Bundles Dd 14.5" M4a1 Riii Upper Receiver W/ Eotech Optics - Dd 14.5" M4a1 Riii Upper W/ E

Brownells has paired up the Daniel Defense 14.5" M4A1 RIII Upper Receiver with your choice of EOTech Red Dot EXPS2-0 or EXPS3-0. Adding to their extremely successful line of stripped M4A1 uppers, Daniel Defense now has the stripped M4A1 upper with... more

Brownells Bundles Dd 10.3" Mk18 Socom Upper Receivers W/ Optics - Dd 10.3" Mk18 Socom Upper W/ Exps2

Brownells has paired up the Daniel Defense MK18 Stripped SOCOM Upper Receiver with your choice of EOTech Red Dot EXPS2-0 or EXPS3-0. Daniel Defense manufactures the highest quality complete AR-15 upper receivers on the market today! Every Daniel... more

New Frontier Armory New Frontier C4 Upper Receiver Ar15 Stripped Billet Black

New Frontier Armory New Frontier C4 Upper Receiver Ar15 Stripped Billet Black. The C-4 Upper Receiver is unique because it was designed with input from former 3rd party contract gunsmiths. Through this process the upper receiver is given a clean... more

Brownells Brn-180 Gen 2 Complete Upper Receiver Assembly - Brn-180 Gen 2 16" 7.62x39mm Upper Receive

BRN-180 Upper Receiver Group Gen2 Reliable Piston System Made Even More Versatile Designed in conjunction with PWS & FM Products, the Brownells BRN-180 Complete Upper Receiver is inspired by the Armalite AR-180 of the 1960s. Developed as a successor to... more

TacFire Complete Upper Assembly 9mm 4in Black Large BU-9MM-4

TacFire Complete Upper Assembly 9mm 4in Black Large BU-9MM-4. . Formulated using some of the most heavy duty and long lasting substances around these AR15 Upper Receivers through TacFire offers you a product that will give you years of dependability.... more

Brownells Ar-15 Upper Receiver Completion Kits - M16a2 Upper Receiver Completion Kit

Complete any type of AR-15 Upper Receiver with these Completion Kits! Whether you have an old school retro slickside carry handle upper or a modern M4 flat top, one of these kits is the solution to complete your build. Each kit is specifically composed... more

Brownells Ar-15 Upper Receiver Insert - Ar-15 Upper Receiver Insert Black

An AR-15 Upper Receiver Sear Cut Insert to keep AR-15 from going into Full Auto Mode. The insert is hard coat anodized. Great for areas with these specific restrictions! Mfg: Brownells more

Brownells Ar-15 Upper Receiver Completion Kits - M4 Upper Receiver Completion Kit

Complete any type of AR-15 Upper Receiver with these Completion Kits! Whether you have an old school retro slickside carry handle upper or a modern M4 flat top, one of these kits is the solution to complete your build. Each kit is specifically composed... more

Brownells Ar-15 C7 Stripped Upper Receiver - Ar-15 C7 Stripped Upper Receiver Black

Brownells expanded its lineup of retro AR-15 components with the new Brownells C7 Stripped Upper Receiver. This unique receiver design features the correct carry-handle contours for Canadian C7 clones or the Colt Model 723 used by the military during... more

Brownells Ar-15/M16 M16a2 Stripped Upper Receiver - Ar-15 M16a2 Stripped Upper Receiver Black 5.56x4

USGI style M16A2 Stripped Upper Receiver, ready for a new Retro build Machined from a carry handle forging, this M16A2 Stripped Upper Receiver is compatible with standard AR-15 components, such as barrels and bolt carrier groups. Check out the... more

Brownells Ar-15 Slickside Upper Receiver - Ar-15 Slickside Upper Receiver Black

The Brownells AR-15 / M16 Slickside Upper Receiver precisely mirrors the contours of the original, early AR-15 upper receiver. Perfect for your next "Retro" or reproduction build, our upper has the following features specific to the original Slickside:... more

Fostech FLITE Elite Stripped Upper Reciever Tungsten 6880-TUN

Fostech FLITE Elite Stripped Upper Reciever Tungsten 6880-TUN. These uppers weigh in at only 4.92 ounces. Compare this to a standard Aluminum stripped upper at 6.92 ounces and you have a nearly 30percent weight reduction. Specifications for Fostech... more

Brownells Brn-180s(TM) Gen2 13.9/14.5 223/5.56 Complete Upper Receiver Assy - Brn-180 Gen 2 13.9" 22

Designed in conjunction with PWS & FM Products, the Brownells BRN-180S Complete Upper Receiver is the newest iteration of the BRN-180 Upper Receiver, which was inspired by the Armalite AR-180 of the 1960s. The BRN-180S shares a large chunk of... more

Brownells Brn-180s(TM) Gen2 13.9/14.5 223/5.56 Complete Upper Receiver Assy - Brn-180s Gen 2 14.5" 2

Designed in conjunction with PWS & FM Products, the Brownells BRN-180S Complete Upper Receiver is the newest iteration of the BRN-180 Upper Receiver, which was inspired by the Armalite AR-180 of the 1960s. The BRN-180S shares a large chunk of... more

FM Products MIKE-9 9mm Complete Upper Receiver 23.75 inch 16 inch Barrel Front Charge 1-10 Twist 1/2x36 Thread Free-Float Nitride Black MIKE9U-F1615-4

FM Products MIKE-9 9mm Complete Upper Receiver 23.75 inch 16 inch Barrel Front Charge 1-10 Twist 1/2x36 Thread Free-Float Nitride Black MIKE9U-F1615-4. . These AR15 Upper Receivers through the professional product experts at FM Products are designed by... more

Aero Precision EPC-9 - 9/40 Threaded Stripped Upper Receiver w/ LRBHO Kodiak Brown APAR620280AC

Aero Precision EPC-9 - 9/40 Threaded Stripped Upper Receiver w/ LRBHO Kodiak Brown APAR620280AC. . Formulated by using some of the most extremely robust and dependable substances in existence these AR15 Upper Receivers from Aero Precision offers you an... more

Aero Precision AR15 Stripped Upper Receiver Kodiak Brown APAR501664AC

Aero Precision AR15 Stripped Upper Receiver Kodiak Brown APAR501664AC. These AR15 Upper Receivers from Aero Precision are forged from 7075-T6 aluminum and precision machined to mil-spec M16/M4 specifications. The Aero Precision Stripped AR15 Upper... more

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

Aero Precision M4E1 Assembled Upper Receiver Thread M-LOK Handguard Anodized Brown APAR700222AC. Aero Precision machined these AR15 Upper Receivers from rugged and lightweight 7075-T6 forged aluminum complete with your choice of finish that enhances... more

Aero Precision M4E1 Enhanced Stripped Upper Receiver Kodiak Brown APAR600216AC

Aero Precision M4E1 Enhanced Stripped Upper Receiver Kodiak Brown APAR600216AC. Developed using several of the most extremely durable and dependable components around these AR15 Upper Receivers through Aero Precision will provide you with a product... more

Brownells Bundles M5 16" Assembled Upper Receiver 308 Win W/ Optics - Aero M5 16" Upper Mid-Length W

Brownells is offering a great deal to our customers! We have paired up the Aero Precision M5 308 Winchester Assembled Upper Receiver with your choice of four different optics. The R-ONE handguards are designed with size and weight in mind, while still... more

Brownells Bundles M5 16" Assembled Upper Receiver 308 Win W/ Optics - Aero M5 16" Upper Mid-Length W

Brownells is offering a great deal to our customers! We have paired up the Aero Precision M5 308 Winchester Assembled Upper Receiver with your choice of four different optics. The R-ONE handguards are designed with size and weight in mind, while still... more

Brownells Qrb Upper Receiver Takedown Kits W/ Law Folding Adapter - Qrb Upper Takedown Kit Carbine W

The Cry Havoc Tactical QRB (Quick Release Barrel) 2 Pin Upper Receiver Takedown Kit for AR-15 style rifles or pistols. While the QRB was primarily designed for the civilian market, non-civilian applications range from the Air Force using the QRB on the... more

Brownells M4a1 Riii 14.5" Stripped Upper Receivers W/ Law Folder - M4a1 Riii 14.5" Stripped Upper W/

Brownells has paired the Daniel Defense Stripped M4A1 Upper Receiver with the ever popular LAW Tactical Folding Stock Adapter! The Daniel Defense upper is finished in the Desert Dark Color they are known for and we have added the option of either a... more