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Guns For Sale - Hinterland Outfitters Online Gun Shop
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CIV      STRIPPED UPPER

Hinterland Item #75378

Manufacturer Item #SU556

CIV STRIPPED UPPER

Our Price: $62.30

Availability: **Out of Stock**

Aero Precision APAR501603 AR-15 Multi-Caliber Brl Finish

Hinterland Item #62714

Manufacturer Item #APAR501603

Aero Precision APAR501603 AR-15 Multi-Caliber Brl Finish

Our Price: $64.73

Availability: In Stock

LBE Unlimited M4 Stripped Upper Receiver, Fits AR15, Black Finish ARSTUP

Hinterland Item #72658

Manufacturer Item #ARSTUP

LBE Unlimited M4 Stripped Upper Receiver, Fits AR15, Black Finish ARSTUP

Our Price: $76.04

Availability: In Stock

Yankee Hill Machine Co Stripped A3 Upper Receiver, For AR15, Black Finish YHM-110

Hinterland Item #73906

Manufacturer Item #YHM-110

Yankee Hill Machine Co Stripped A3 Upper Receiver, For AR15, Black Finish YHM-110

Our Price: $83.10

Availability: In Stock

Aero Precision APAR501603A  Multi-Caliber     Black Anodized Finish

Hinterland Item #62715

Manufacturer Item #APAR501603A

Aero Precision APAR501603A Multi-Caliber Black Anodized Finish

Our Price: $84.84

Availability: **Out of Stock**

Aero Precision APAR501801 Multi-Caliber     FDE Finish

Hinterland Item #62716

Manufacturer Item #APAR501801

Aero Precision APAR501801 Multi-Caliber FDE Finish

Our Price: $84.96

Availability: In Stock

Bravo LRG-STK-MOD BCM Multi-Caliber  Brl Finish

Hinterland Item #62719

Manufacturer Item #4URM4

Bravo LRG-STK-MOD BCM Multi-Caliber Brl Finish

Our Price: $100.77

Availability: In Stock

KE Arms Stripped Upper, Forged, 223 Rem/556NATO, Black Finish, w/Forward Assist and Dust Cover, M4 Feed Ramps and T-Marked 1-50-03-008

Hinterland Item #72526

Manufacturer Item #1-50-03-008

KE Arms Stripped Upper, Forged, 223 Rem/556NATO, Black Finish, w/Forward Assist and Dust Cover, M4 Feed Ramps and T-Marked 1-50-03-008

Our Price: $101.07

Availability: In Stock

LBE Unlimited Upper, Black Finish, Forward Assist/Ejection Port Cover Assembly Installed, Fits AR15 ARUPPER

Hinterland Item #72659

Manufacturer Item #ARUPPER

LBE Unlimited Upper, Black Finish, Forward Assist/Ejection Port Cover Assembly Installed, Fits AR15 ARUPPER

Our Price: $101.15

Availability: In Stock

Aero Precision APAR501801A Complete Stripped Upper Multi-Caliber  Brl Finish

Hinterland Item #62717

Manufacturer Item #APAR501801A

Aero Precision APAR501801A Complete Stripped Upper Multi-Caliber Brl Finish

Our Price: $101.16

Availability: **Out of Stock**

Spikes SFT50M4 M4 Flat Top Upper Receiver Multi-Caliber 7075 T6 Aluminum Black

Hinterland Item #62753

Manufacturer Item #SFT50M4

Spikes SFT50M4 M4 Flat Top Upper Receiver Multi-Caliber 7075 T6 Aluminum Black

Our Price: $103.50

Availability: In Stock

Black Rain Ordnance SPEC15 Stripped Upper, Forged, 223 Rem/556NATO, Black Finish BRO-SPEC15-UR

Hinterland Item #71611

Manufacturer Item #BRO-SPEC15-UR

Black Rain Ordnance SPEC15 Stripped Upper, Forged, 223 Rem/556NATO, Black Finish BRO-SPEC15-UR

Our Price: $105.44

Availability: In Stock

BRO BROSPEC15UR FORGED UPPER REC

Hinterland Item #75314

Manufacturer Item #BROSPEC15UR

BRO BROSPEC15UR FORGED UPPER REC

Our Price: $120.29

Availability: In Stock

Aero Precision APAR308503C M5 308 Winchester/7.62 NATO   Brl Finish

Hinterland Item #62706

Manufacturer Item #APAR308503C

Aero Precision APAR308503C M5 308 Winchester/7.62 NATO Brl Finish

Our Price: $122.28

Availability: In Stock

Noveske Generation 1 Stripped Upper, M4, Black Finish 03000083

Hinterland Item #73098

Manufacturer Item #03000083

Noveske Generation 1 Stripped Upper, M4, Black Finish 03000083

Our Price: $126.41

Availability: In Stock

Aero Precision APAR308503A M5 308 Winchester/7.62 NATO  Brl Finish

Hinterland Item #62705

Manufacturer Item #APAR308503A

Aero Precision APAR308503A M5 308 Winchester/7.62 NATO Brl Finish

Our Price: $139.40

Availability: In Stock

Aero Precision APAR308505C M5 308 Winchester/7.62 NATO Brl Finish

Hinterland Item #62708

Manufacturer Item #APAR308505C

Aero Precision APAR308505C M5 308 Winchester/7.62 NATO Brl Finish

Our Price: $143.69

Availability: In Stock

Primary Weapons BP-UR Bootleg Stripped Multi-Caliber

Hinterland Item #62720

Manufacturer Item #BP-UR

Primary Weapons BP-UR Bootleg Stripped Multi-Caliber

Our Price: $146.13

Availability: **Out of Stock**

Lantac LA00270 Side Charger Multi-Caliber

Hinterland Item #62744

Manufacturer Item #LA00270

Lantac LA00270 Side Charger Multi-Caliber

Our Price: $147.62

Availability: In Stock

Vltor MUR1S Modular Upper Receiver 223 Rem/5.56 NATO w/out Forward Assist Black

Hinterland Item #62766

Manufacturer Item #MUR1S

Vltor MUR1S Modular Upper Receiver 223 Rem/5.56 NATO w/out Forward Assist Black

Our Price: $148.04

Availability: **Out of Stock**

Colt's Manufacturing Upper, 223REM/556NATO, Black Finish, Dust Cover, Forward Assist, M4 Feed Ramps SP63528

Hinterland Item #71792

Manufacturer Item #SP63528

Colt's Manufacturing Upper, 223REM/556NATO, Black Finish, Dust Cover, Forward Assist, M4 Feed Ramps SP63528

Our Price: $150.37

Availability: **Out of Stock**

Aero Precision APAR308505A M5 308 Winchester/7.62 NATO Brl Finish

Hinterland Item #62707

Manufacturer Item #APAR308505A

Aero Precision APAR308505A M5 308 Winchester/7.62 NATO Brl Finish

Our Price: $160.83

Availability: In Stock

Vltor MUR1A Modular Upper Receiver 223 Rem/5.56 NATO With Forward Assist Black

Hinterland Item #62765

Manufacturer Item #MUR1A

Vltor MUR1A Modular Upper Receiver 223 Rem/5.56 NATO With Forward Assist Black

Our Price: $163.05

Availability: **Out of Stock**

VLTOR MUR, Upper, Hammer Forged, Fits AR15/M16, Modular Upper Receiver, includes Shell Deflector and Forward Assist MUR-1AB

Hinterland Item #73780

Manufacturer Item #MUR-1AB

VLTOR MUR, Upper, Hammer Forged, Fits AR15/M16, Modular Upper Receiver, includes Shell Deflector and Forward Assist MUR-1AB

Our Price: $172.01

Availability: In Stock

Yankee Hill 110-B2 Second Billet 223 Remington/5.56 NATO Black Finish

Hinterland Item #62778

Manufacturer Item #110B2

Yankee Hill 110-B2 Second Billet 223 Remington/5.56 NATO Black Finish

Our Price: $177.30

Availability: In Stock

Yankee Hill 110-BILLET Billet Upper Receiver 223 Rem/5.56 NATO Black

Hinterland Item #62779

Manufacturer Item #110BILLET

Yankee Hill 110-BILLET Billet Upper Receiver 223 Rem/5.56 NATO Black

Our Price: $177.30

Availability: In Stock

Lantac LA00221 Advaced Receiver Multi-Caliber

Hinterland Item #62743

Manufacturer Item #LA00221

Lantac LA00221 Advaced Receiver Multi-Caliber

Our Price: $182.03

Availability: In Stock

Black Rain Ordnance Milled Upper Receiver, Gen 3, 223 Rem/556NATO, Black Finish BRO-MUR-GEN3

Hinterland Item #71609

Manufacturer Item #BRO-MUR-GEN3

Black Rain Ordnance Milled Upper Receiver, Gen 3, 223 Rem/556NATO, Black Finish BRO-MUR-GEN3

Our Price: $187.59

Availability: **Out of Stock**

Black Rain Ordnance Milled Upper Receiver, 223 Rem/556NATO, Flat Top Sights, Black Finish BRO-MUR-2

Hinterland Item #71608

Manufacturer Item #BRO-MUR-2

Black Rain Ordnance Milled Upper Receiver, 223 Rem/556NATO, Flat Top Sights, Black Finish BRO-MUR-2

Our Price: $192.72

Availability: In Stock

Seekins Precision Billet Upper, 223 Rem, Black Finish 0010900009

Hinterland Item #73434

Manufacturer Item #0010900009

Seekins Precision Billet Upper, 223 Rem, Black Finish 0010900009

Our Price: $195.16

Availability: In Stock

Stag Arms LLC Conversion Kit, 22LR, Left Hand, Fits AR Rifles, Black, 25Rd, 1 Magazine SAK22L

Hinterland Item #73565

Manufacturer Item #SAK22L

Stag Arms LLC Conversion Kit, 22LR, Left Hand, Fits AR Rifles, Black, 25Rd, 1 Magazine SAK22L

Our Price: $199.25

Availability: **Out of Stock**

CMMG AR Conversion Kit, 22LR, Stainless Steel Bolt Group, 3 Magazines, 25Rd 22BA651

Hinterland Item #71783

Manufacturer Item #22BA651

CMMG AR Conversion Kit, 22LR, Stainless Steel Bolt Group, 3 Magazines, 25Rd 22BA651

Our Price: $201.61

Availability: In Stock

Billet Rifle Systems Independence Billet Upper, 223 Rem/556NATO, Black Finish IND-U-BA

Hinterland Item #71562

Manufacturer Item #IND-U-BA

Billet Rifle Systems Independence Billet Upper, 223 Rem/556NATO, Black Finish IND-U-BA

Our Price: $208.06

Availability: **Out of Stock**

2A Armament BALIOS, Upper, 556NATO, Black, 1913 Rail for Mounting Optics and Accessories, Billet 7075-T6 Aluminum, AR Rifles, Flat Top 2A-MCBU-1

Hinterland Item #71303

Manufacturer Item #2A-MCBU-1

2A Armament BALIOS, Upper, 556NATO, Black, 1913 Rail for Mounting Optics and Accessories, Billet 7075-T6 Aluminum, AR Rifles, Flat Top 2A-MCBU-1

Our Price: $210.54

Availability: **Out of Stock**

Seekins Precision Integrated Rail Mounting Technology, Billet Upper, 223 Rem/556NATO, Black Finish 0010900007

Hinterland Item #73433

Manufacturer Item #0010900007

Seekins Precision Integrated Rail Mounting Technology, Billet Upper, 223 Rem/556NATO, Black Finish 0010900007

Our Price: $219.40

Availability: In Stock

Spike's Tactical Gen 2 Billet Upper Receiver, 223 Rem/556NATO, Black Finish, Mil-Spec Barrel Nut SFT50B2

Hinterland Item #73557

Manufacturer Item #SFT50B2

Spike's Tactical Gen 2 Billet Upper Receiver, 223 Rem/556NATO, Black Finish, Mil-Spec Barrel Nut SFT50B2

Our Price: $243.00

Availability: In Stock

Noveske Generation 3 Stripped Upper, Black Finish 03000169

Hinterland Item #73100

Manufacturer Item #03000169

Noveske Generation 3 Stripped Upper, Black Finish 03000169

Our Price: $292.91

Availability: In Stock

Noveske Generation 3 Stripped Upper, FDE Cerakote Finish 03000086

Hinterland Item #73099

Manufacturer Item #03000086

Noveske Generation 3 Stripped Upper, FDE Cerakote Finish 03000086

Our Price: $302.71

Availability: In Stock

DPMS Upper, Oracle, 556NATO, 16" Barrel, Fits AR-15, Flat Top, Black Finish 60585

Hinterland Item #71917

Manufacturer Item #60585

DPMS Upper, Oracle, 556NATO, 16" Barrel, Fits AR-15, Flat Top, Black Finish 60585

Our Price: $307.74

Availability: In Stock

Radical Firearms CFU16556M412 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vandium Steel Melanite Coated Black Brl Finish

Hinterland Item #62749

Manufacturer Item #CFU16556M412

Radical Firearms CFU16556M412 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vandium Steel Melanite Coated Black Brl Finish

Our Price: $309.63

Availability: In Stock

Radical Firearms Complete Upper Assembly, 223 Rem/556NATO, 16" SOCOM (Mid) Barrel, 15" FCR, A2 Flash Hider, Black Finish CFU16-5.56SOC-15FCR

Hinterland Item #73347

Manufacturer Item #CFU16-5.56SOC-15FCR

Radical Firearms Complete Upper Assembly, 223 Rem/556NATO, 16" SOCOM (Mid) Barrel, 15" FCR, A2 Flash Hider, Black Finish CFU16-5.56SOC-15FCR

Our Price: $313.26

Availability: **Out of Stock**

Radical Firearms CFU16556M415 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vandium Steel Melanite Coated Black Brl Finish

Hinterland Item #62751

Manufacturer Item #CFU16556M415

Radical Firearms CFU16556M415 AR-15 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vandium Steel Melanite Coated Black Brl Finish

Our Price: $320.26

Availability: **Out of Stock**

Radical Firearms Complete Upper Assembly, 300 Blackout, 16" HBAR Contour Barrel, 15" FCR, A2 Flash Hider, Black Finish CFU16-300HBAR-15FCR

Hinterland Item #73345

Manufacturer Item #CFU16-300HBAR-15FCR

Radical Firearms Complete Upper Assembly, 300 Blackout, 16" HBAR Contour Barrel, 15" FCR, A2 Flash Hider, Black Finish CFU16-300HBAR-15FCR

Our Price: $328.39

Availability: **Out of Stock**

Sig Sauer X-Change Kit, 40 S&W, Black, Sig Sauer P320 Full Size, 13Rd CALX-320C-40-BSS

Hinterland Item #73452

Manufacturer Item #CALX-320C-40-BSS

Sig Sauer X-Change Kit, 40 S&W, Black, Sig Sauer P320 Full Size, 13Rd CALX-320C-40-BSS

Our Price: $331.89

Availability: **Out of Stock**

Core Rifle Systems Upper, MLOK Handguard, 223 Rem/556NATO, 16" Barrel, 1:9 Twist, Flat Top, Black Finish 13976

Hinterland Item #71803

Manufacturer Item #13976

Core Rifle Systems Upper, MLOK Handguard, 223 Rem/556NATO, 16" Barrel, 1:9 Twist, Flat Top, Black Finish 13976

Our Price: $341.87

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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