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Guns For Sale - Hinterland Outfitters Online Gun Shop
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Radical Firearms CFU16556M412 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vanadium Steel M4 Profile Black Brl Finish

Hinterland Item #62750

Manufacturer Item #CFU16556M412

Radical Firearms CFU16556M412 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vanadium Steel M4 Profile Black Brl Finish

Our Price: $360.79

Availability: **Out of Stock**

Radical Firearms CFU16556M415 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vanadium Steel M4 Profile Black Brl Finish

Hinterland Item #62752

Manufacturer Item #CFU16556M415

Radical Firearms CFU16556M415 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vanadium Steel M4 Profile Black Brl Finish

Our Price: $361.97

Availability: **Out of Stock**

DPMS BA22AP4 AP4 22 Long Rifle 16" 4140 Steel Black Brl Finish

Hinterland Item #62738

Manufacturer Item #BA22AP4

DPMS BA22AP4 AP4 22 Long Rifle 16" 4140 Steel Black Brl Finish

Our Price: $369.85

Availability: **Out of Stock**

Bushmaster 92194 Flat Top ORC 5.56 Upper Receiver

Hinterland Item #41622

Manufacturer Item #92194

Bushmaster 92194 Flat Top ORC 5.56 Upper Receiver

Our Price: $388.70

Availability: In Stock

Bushmaster 91822 5.56 A3 Receiver M4

Hinterland Item #41620

Manufacturer Item #91822

Bushmaster 91822 5.56 A3 Receiver M4

Our Price: $394.32

Availability: In Stock

Radical Firearms Complete Upper Assembly, 223 Rem/556NATO, 16" SOCOM (Mid) Barrel, 15" RPR, Zero Impulse Muzzle Brake, Black Finish CFU16-5.56SOC-15RPR-ZS

Core Rifle Systems Upper, 223 Rem/556NATO, 16" M4 Profile Barrel, A2Flash Hider, Front Sight Base, Black Finish 100276

Hinterland Item #71801

Manufacturer Item #100276

Core Rifle Systems Upper, 223 Rem/556NATO, 16" M4 Profile Barrel, A2Flash Hider, Front Sight Base, Black Finish 100276

Our Price: $396.26

Availability: **Out of Stock**

VLTOR VIS-KM Fusion Polylithic Upper with 15" KeyMod Handguard, Shell Deflector and Forward Assist, Hard Coat Anodized Finish, Black VIS-F15

Hinterland Item #73781

Manufacturer Item #VIS-F15

VLTOR VIS-KM Fusion Polylithic Upper with 15" KeyMod Handguard, Shell Deflector and Forward Assist, Hard Coat Anodized Finish, Black VIS-F15

Our Price: $396.26

Availability: **Out of Stock**

DPMS Upper, 223 Rem, 556NATO, Black, A2 60580

Hinterland Item #71916

Manufacturer Item #60580

DPMS Upper, 223 Rem, 556NATO, Black, A2 60580

Our Price: $397.61

Availability: In Stock

Bushmaster 92866 Flat Top M4 Pre Ban 300 AAC Blackout/7.62x39mm 16" Carbon Steel Blk Parkerized Brl Finish

Hinterland Item #62722

Manufacturer Item #92866

Bushmaster 92866 Flat Top M4 Pre Ban 300 AAC Blackout/7.62x39mm 16" Carbon Steel Blk Parkerized Brl Finish

Our Price: $458.86

Availability: In Stock

ATI ATIRKT03 5.56 Rifle Upper Kit 223/5.56 NATO 16" 6-Pos Collapsible Stk Blk

Hinterland Item #62718

Manufacturer Item #RKT03

ATI ATIRKT03 5.56 Rifle Upper Kit 223/5.56 NATO 16" 6-Pos Collapsible Stk Blk

Our Price: $464.75

Availability: In Stock

CMMG M4 Target Upper 22B7CA4, 22 LR

Hinterland Item #58099

Manufacturer Item #22B7CA4

CMMG M4 Target Upper 22B7CA4, 22 LR

Our Price: $474.77

Availability: In Stock

Radical Firearms Complete Upper Assembly, 458 Socom, 16" Barrel (.936), 15" MHR, Panzer Muzzle Brake, Black Finish CFU16-458SOC-15MHR

Hinterland Item #73346

Manufacturer Item #CFU16-458SOC-15MHR

Radical Firearms Complete Upper Assembly, 458 Socom, 16" Barrel (.936), 15" MHR, Panzer Muzzle Brake, Black Finish CFU16-458SOC-15MHR

Our Price: $474.85

Availability: **Out of Stock**

CMMG 22B7CC6 MK4LE 22 LR 16" Chrome Moly Steel M4 Profile Blk Brl Blk Rec

Hinterland Item #62723

Manufacturer Item #22B7CC6

CMMG 22B7CC6 MK4LE 22 LR 16" Chrome Moly Steel M4 Profile Blk Brl Blk Rec

Our Price: $478.02

Availability: In Stock

Windham Weaponry UR16LHB Complete Upper Assembly 223 Remington/5.56 NATO 16"  Blk

Hinterland Item #62774

Manufacturer Item #UR16LHB

Windham Weaponry UR16LHB Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Our Price: $490.29

Availability: In Stock

Windham Weaponry UR16M4LHB Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Hinterland Item #62776

Manufacturer Item #UR16M4LHB

Windham Weaponry UR16M4LHB Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Our Price: $490.29

Availability: In Stock

Rock River Arms CAR A4 Upper, 223 Rem/556NATO, 16" Barrel, 1:9 Twist, Black Finish, Mid-Length Handguard, A2 Flash Hider AR0874B

Hinterland Item #73354

Manufacturer Item #AR0874B

Rock River Arms CAR A4 Upper, 223 Rem/556NATO, 16" Barrel, 1:9 Twist, Black Finish, Mid-Length Handguard, A2 Flash Hider AR0874B

Our Price: $492.83

Availability: In Stock

Radical Firearms Complete Upper Assembly, 6.5 Grendel, 20" Barrel, 15" RPR, Pepper Pot Muzzle Brake, Black Finish CFU20-6.5-SS-MED-15RPR

Hinterland Item #73349

Manufacturer Item #CFU20-6.5-SS-MED-15R

Radical Firearms Complete Upper Assembly, 6.5 Grendel, 20" Barrel, 15" RPR, Pepper Pot Muzzle Brake, Black Finish CFU20-6.5-SS-MED-15RPR

Our Price: $508.14

Availability: **Out of Stock**

CMMG 10218 223 Upper, 16 in, GAS, Frt Sight

Hinterland Item #37969

Manufacturer Item #55BE1F0

CMMG 10218 223 Upper, 16 in, GAS, Frt Sight

Our Price: $517.06

Availability: In Stock

CMMG 30B8188 Upper Group 300 AAC Blackout/Whisper (7.62x35mm) 8" 4140 Chrome Moly Steel Medium Taper Blk Brl Finish

Hinterland Item #62725

Manufacturer Item #30B8188

CMMG 30B8188 Upper Group 300 AAC Blackout/Whisper (7.62x35mm) 8" 4140 Chrome Moly Steel Medium Taper Blk Brl Finish

Our Price: $517.06

Availability: In Stock

Spike STU5025-M4S ST-15 LE Carbine Upper 5.56 16"  M4 Profile Brl A2 Sights Blk

Hinterland Item #62754

Manufacturer Item #STU5025M4S

Spike STU5025-M4S ST-15 LE Carbine Upper 5.56 16" M4 Profile Brl A2 Sights Blk

Our Price: $522.00

Availability: In Stock

CMMG 11083 300 AAC Blackout AR-15 Carbine Complete Upper 16" M4 Handguard

Hinterland Item #62726

Manufacturer Item #30BF8C0

CMMG 11083 300 AAC Blackout AR-15 Carbine Complete Upper 16" M4 Handguard

Our Price: $524.42

Availability: In Stock

Spike STU5035-MLS ST-15 LE Mid Upper 5.56 16"  Gov''t Profile Brl A2 Sights Blk

Hinterland Item #62756

Manufacturer Item #STU5035MLS

Spike STU5035-MLS ST-15 LE Mid Upper 5.56 16" Gov''t Profile Brl A2 Sights Blk

Our Price: $531.00

Availability: In Stock

ADAMS 01235 P1 UPPER 5.56 16IN

Hinterland Item #75001

Manufacturer Item #01235

ADAMS 01235 P1 UPPER 5.56 16IN

Our Price: $535.47

Availability: **Out of Stock**

DPMS Oracle, Upper, 308 Win, 16", Black, A2, AR Rifles, Flat Top 60603

Hinterland Item #71919

Manufacturer Item #60603

DPMS Oracle, Upper, 308 Win, 16", Black, A2, AR Rifles, Flat Top 60603

Our Price: $541.67

Availability: In Stock

Aero Precision APAR308554P2 M5E1 308 Winchester/7.62 NATO 16" Chrome Moly Steel CMV-Mid Length Blk Hard Coat Anodized Brl Finish

Hinterland Item #62711

Manufacturer Item #APAR308554P22

Aero Precision APAR308554P2 M5E1 308 Winchester/7.62 NATO 16" Chrome Moly Steel CMV-Mid Length Blk Hard Coat Anodized Brl Finish

Our Price: $552.26

Availability: In Stock

CMMG Upper MK4LE, 300 AAC Blackout, 16" Barrel, 1:7 Twist, M16 Bolt Group, Railed Gas Block, Black 30BF85F

Hinterland Item #71778

Manufacturer Item #30BF85F

CMMG Upper MK4LE, 300 AAC Blackout, 16" Barrel, 1:7 Twist, M16 Bolt Group, Railed Gas Block, Black 30BF85F

Our Price: $552.77

Availability: In Stock

Bushmaster 92820 5.56, 24 in BBL, Flat Top Varminter Upper Receiver

Hinterland Item #41627

Manufacturer Item #92820

Bushmaster 92820 5.56, 24 in BBL, Flat Top Varminter Upper Receiver

Our Price: $553.07

(2 Customer Reviews)

Availability: In Stock

CMMG 30B129A MK4 T 300 AAC Blackout/Whisper (7.62x35mm) 16" 4140 Steel Blk

Hinterland Item #62724

Manufacturer Item #30B129A

CMMG 30B129A MK4 T 300 AAC Blackout/Whisper (7.62x35mm) 16" 4140 Steel Blk

Our Price: $556.38

Availability: In Stock

CMMG 55BC76A MK4 T 223 Remington/5.56 NATO 16" 4140 Steel Threaded Black

Hinterland Item #62728

Manufacturer Item #55BC76A

CMMG 55BC76A MK4 T 223 Remington/5.56 NATO 16" 4140 Steel Threaded Black

Our Price: $556.38

Availability: In Stock

Aero Precision APAR308554P2 M5E1 308 Winchester/7.62 NATO 18" Chrome Moly Steel CMV-Rifle Length Blk Hard Coat Anodized Brl Finish

Hinterland Item #62712

Manufacturer Item #APAR308554P25

Aero Precision APAR308554P2 M5E1 308 Winchester/7.62 NATO 18" Chrome Moly Steel CMV-Rifle Length Blk Hard Coat Anodized Brl Finish

Our Price: $556.73

Availability: In Stock

DRD Tactical Stripped Upper .308 Win 13" DRD Quad Rail No BCG, Charging Handle, or Case Matte Black U762-BK-DPMS

Hinterland Item #74007

Manufacturer Item #U762-BK-DPMS

DRD Tactical Stripped Upper .308 Win 13" DRD Quad Rail No BCG, Charging Handle, or Case Matte Black U762-BK-DPMS

Our Price: $559.95

Availability: In Stock

Windham Weaponry UR16A4B Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Hinterland Item #62773

Manufacturer Item #UR16A4B

Windham Weaponry UR16A4B Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Our Price: $571.83

Availability: In Stock

Smith and Wesson .223 Caliber  MP15 Complete Upper Assembly 812003

Hinterland Item #14059

Manufacturer Item #812003

Smith and Wesson .223 Caliber MP15 Complete Upper Assembly 812003

Our Price: $572.76

(1 Customer Review)

Availability: In Stock

Colt Mfg AR6720CK-NHG AR6720 223 Remington/5.56 NATO 16.1" Steel Chrome-Lined Black Hard Coat Anodized Brl Finish

Hinterland Item #62731

Manufacturer Item #AR6720CK-NHG

Colt Mfg AR6720CK-NHG AR6720 223 Remington/5.56 NATO 16.1" Steel Chrome-Lined Black Hard Coat Anodized Brl Finish

Our Price: $576.09

Availability: **Out of Stock**

Windham Weaponry UR16M4A4B Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Hinterland Item #62775

Manufacturer Item #UR16M4A4B

Windham Weaponry UR16M4A4B Complete Upper Assembly 223 Remington/5.56 NATO 16" Blk

Our Price: $577.57

Availability: In Stock

Aero Precision APAR308534P2 New 308 Winchester/7.62 NATO 16.0" 4150 Chrome Moly Vandium Steel  Black Brl Finish

Hinterland Item #62709

Manufacturer Item #APAR308534P22

Aero Precision APAR308534P2 New 308 Winchester/7.62 NATO 16.0" 4150 Chrome Moly Vandium Steel Black Brl Finish

Our Price: $581.98

Availability: **Out of Stock**

Aero Precision APAR308534P2 M5E1 308 Winchester/7.62 NATO 18" Chrome Moly Steel Stainless Steel Black Hard Coat Anodized Brl Finish

Hinterland Item #62710

Manufacturer Item #APAR308534P26

Aero Precision APAR308534P2 M5E1 308 Winchester/7.62 NATO 18" Chrome Moly Steel Stainless Steel Black Hard Coat Anodized Brl Finish

Our Price: $583.55

Availability: In Stock

Bushmaster 91702 Flat Top 450 Bushmaster Upper Receiver w/ Izzy Suppressor, 20in Barrel

Hinterland Item #41628

Manufacturer Item #91702

Bushmaster 91702 Flat Top 450 Bushmaster Upper Receiver w/ Izzy Suppressor, 20in Barrel

Our Price: $583.75

(1 Customer Review)

Availability: **Out of Stock**

Bushmaster 91700 .450 Upper Assembly

Hinterland Item #32810

Manufacturer Item #91700

Bushmaster 91700 .450 Upper Assembly

Our Price: $589.00

(4 Customer Reviews)

Availability: **Out of Stock**

Bushmaster 92450 5.56, 20 in BBL, Flat Top Predator Upper Receiver

Hinterland Item #41625

Manufacturer Item #92450

Bushmaster 92450 5.56, 20 in BBL, Flat Top Predator Upper Receiver

Our Price: $589.00

(1 Customer Review)

Availability: In Stock

CMMG MK4T Upper, 300 AAC Blackout, 16" Stainless Barrel, Fits AR, Flat Top, A2 Brake Chokes, CMMG RKM11 KeyMod Handguard, Black 30BC353

CMMG 90B3BF0 Upper Group 9mm 8.5" 4140 Chrome Moly Steel Medium Taper Black Brl Finish

Hinterland Item #62729

Manufacturer Item #90B3BF0

CMMG 90B3BF0 Upper Group 9mm 8.5" 4140 Chrome Moly Steel Medium Taper Black Brl Finish

Our Price: $591.89

Availability: In Stock

Aero Precision APAR308554P2 M5E1 308 Winchester/7.62 NATO 18" Chrome Moly Steel Blk Hard Coat Anodized Brl Finish

Hinterland Item #62713

Manufacturer Item #APAR308554P26

Aero Precision APAR308554P2 M5E1 308 Winchester/7.62 NATO 18" Chrome Moly Steel Blk Hard Coat Anodized Brl Finish

Our Price: $596.98

Availability: In Stock

CMMG 10233 9mm Upper, 16 in, Frt Sight

Hinterland Item #37970

Manufacturer Item #90B1AA2

CMMG 10233 9mm Upper, 16 in, Frt Sight

Our Price: $601.03

Availability: In Stock

Spikes STU5435-MLS ST-15 Enhanced Mid Length Upper 5.56 16" CHF Brl Black

Hinterland Item #62763

Manufacturer Item #STU5435MLS

Spikes STU5435-MLS ST-15 Enhanced Mid Length Upper 5.56 16" CHF Brl Black

Our Price: $612.00

Availability: In Stock

DRD Tactical U556KIT AR Build Kit 223 Remington/5.56 NATO

Hinterland Item #62703

Manufacturer Item #U556KIT

DRD Tactical U556KIT AR Build Kit 223 Remington/5.56 NATO

Our Price: $612.33

Availability: In Stock

DRD Tactical U762KIT AR Built Kit 308 Winchester/7.62 NATO

Hinterland Item #62704

Manufacturer Item #U762KIT

DRD Tactical U762KIT AR Built Kit 308 Winchester/7.62 NATO

Our Price: $612.33

Availability: In Stock

Result Pages:

Upper Receivers

An upper receiver refers to the front and top section of an AR-style rifle. An AR-15 upper receiver contains about 80% of the rifle’s functionality, including the fore stock, forward assist, charging handle, barrel, gas operating system, bolt and bolt carrier assembly. Most upper receivers are MISPEC, meaning you can use them with many different lower receivers, and it allows you to easily transition between barrel lengths, AR-15 parts and calibers.

When you’re ready to begin building your own MSR rifle, be sure to take a look at some of the most popular upper receiver brands, including:

  • Spikes Tactical
  • Midwest Industries
  • Sig Sauer
  • Smith and Wesson
  • Colt
  • POF
  • Armalite
  • Daniel Defense
  • CMMG
  • Bravo Company
  • Troy Industries
  • Seekins Precision
  • Noveske Rifleworks
  • 2A Armament
  • Barrett

 Anatomy of an Upper Receiver

Before you can decide which upper receiver is right for you, it’s good to understand the major components and differences between them.

  • Operating System: One of the key features and major differences between upper receivers is the operating system. There are essentially two operating systems to choose from with AR-15 rifles—direct gas impingement and gas piston technology. The original AR-15 system, designed by Eugene Stoner, was direct gas impingement (DGI). When the trigger is pulled in a DGI gas system, propellant gas is channeled through a small hole in the barrel, then a tube to where it can directly contact (or impinge) the bolt carrier mechanism. The gas is then pushed toward the rear of the rifle, extracting and ejecting the spent case. The gas is then pushed forward by means of spring-loaded action, and it strips a new round from the cartridge, loading it in the chamber to be fired.

Gas piston technology was first used by Mikhail Kalashnikov with the AK-47, the AR-15’s first rival. Gas piston technology works similarly to DGI, except that the gas is fed into a separate cylinder within the barrel. Within the cylinder, it forces a piston back that pushes the bolt carrier to extract and eject the spent case, and spring-action (like DGI) pushes it back into position while loading a new round.

  • Barrel: The barrel of your upper receiver is one of the most important components to ensure the best possible shooting experience. Barrels play a key role in accuracy of the rifle. Keep in mind that all barrels must be at least 16 inches in accordance with federal law. Anything less than 16 inches is considered an NFA firearm and will require a tax stamp and additional ATF paperwork. Modern AR-15 upper receivers can be fitted with a variety of barrel lengths, ranging from 14-inch carbine barrels to 24-inch target and long-range barrels. Early AR-15 barrels had a twist rate of 1:12 for the .223 Remington, but most modern AR-15s have a 1:7, 1:8 or 1:9 twist rate. The twist rate of a barrel is designed to stabilize the bullet as it passes through the barrel, and every bullet is designed to function with a specific twist rate, so make sure to match the twist rate of your barrel to the bullet you are using.
  • Bolt Carrier Group: This group of components within the upper receiver is responsible for loading the rifle as well as firing correctly and ejecting spent rounds. It is recommended to purchase a fully intact bolt carrier group with your upper receiver, but if you have more expertise and skill, you can assemble your own, which would include a firing pin, bolt, cam pin, extractor and gas key.
  • Charging Handle: The charging handle allows you to manually pull the bolt carrier group back. There are two reasons for this: One, you use the charging handle to load the first round of a new magazine, and two, if a round doesn’t fire properly, you can use the charging handle to expel the faulty load and replace it. The charging handle otherwise remains stationary during normal firing.
  • Forward Assist: You’ll find yourself rarely using this component of your upper receiver. The forward assist is mostly there to ensure dependability. If your bolt happens to not close all the way, you can push the forward assist to close it. Many riflemen do not find the forward assist necessary on modern upper receivers, but it is always there just in case you need it.
  • Rail System and Handguard: You’ll find a large number of handguards and rails to further customize your new AR-15 upper receiver. Handguards and rail covers protect your hand from the heat generated in the barrel as you fire your rifle. Many modern handguards are referred to as rail systems as they come with more points to attach accessories and further customize your rifle. Rail systems and rail kits are great for customizing your rifle, and the most common rail system is the Picatinny rail. With a rail system on your upper receiver, you can easily attach lasers, flashlights, optics, grips, sights and bi-pods.
  • Ejection Port Cover: The purpose of the ejection port cover is to keep the bolt carrier group and internal components of your upper receiver clean. When firing, the ejection port cover opens through the backward movement of the bolt carrier group. If you want it closed, you’ll have to manually shut it. Keeping the ejection port carrier closed when not using the rifle helps prevent dirt and other debris from getting inside your upper receiver.

Variations

While browsing AR-15 upper receivers, there are a few variations you’ll run into and want to consider when trying to choose the best AR setup for you.

  • M4 Feed Ramps: The M4 feed ramp is a modification to the standard AR feed ramp. A standard AR feed ramp is a 45-degree cut into the bottom of the breech of the barrel, while the M4 feed ramp is a 52-degree cut that extends all the way to the bottom of the upper receiver. The shallower angle of the M4 feed ramp allows for smoother and more efficient loading and firing of longer, pointier ammunition.
  • MPI/HPT: While looking at popular upper receivers, you’ll find most saying that they are MPI and HPT tested. To put this in layman’s terms, MPI stands for magnetic particle inspection, and HPT stands for high pressure tested. MPI looks for defaults within the upper receiver that may cause it to malfunction, and HPT ensures the upper receiver and bolt carrier group is able to handle the pressures created when firing high magnitude rounds.
  • A2 Upper: An A2-style upper receiver is aesthetically more like the original Colt AR-15. It has a fixed handle on the top that incorporates a rear sight that is adjustable for both wind and elevation.
  • A4 Upper: A4 upper receivers are often called “flat tops” due to their flat upper surface. Unlike the A2 uppers, the flat accessory rail on the A4 allows for a wider variety of attachments, including an A2-style handle. Further, the A4 upper receiver includes an M4 style feed ramps. You will find that most modern AR-15 components come with M4 feed ramps as a standard.

Muzzle Devices

Muzzle devices can be added to the muzzle of an AR upper receiver to enhance your shooting experience. Popular muzzle devices include compensators, muzzle brakes and flash hiders.

  • Compensators: Compensators help to prevent muzzle climb and improve accuracy by venting gases from the barrel upward and out.
  • Muzzle Brakes: Muzzle brakes help to reduce recoil by up to 40% and improve accuracy by venting gases horizontally. This further reduces muzzle climb while providing a clear line of vision for follow-up shots.
  • Flash Hiders: When firing, gunpowder combustion produces a flash of light as the bullet leaves the barrel. This muzzle flash can give away your position as well as briefly hinder your line of vision. Flash hiders help to counter these disadvantages.

 Sights and Optics

Finally, you’ll want to take a gander at the wide variety of sights and optics available to attach to your upper receiver. From red dot sights to high magnitude scopes, there are many options available to you for your AR-15. Browse our selection of scopes and optics to find the right sight for you. Also, lasers and lights are very common accessories for AR-15s and other modern sporting rifles. They are great for law enforcement, home defense and target practice.

Buyer Considerations and Building Your Own AR

Hinterland Outfitters offers all the best brands for AR-15 upper receivers and AR-15 accessories. Our award-winning customer service team is ready to help you today, so don’t hesitate to contact us with all your questions and needs. We will help you choose the right upper receiver and build the perfect AR-15 for you.

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