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AR-15 Uppers

Hinterland Outfitters offers a huge selection of AR-15 upper receivers in complete or stripped configurations. AR-15 upper complete assemblies include the receiver housing, barrel, handguard, gas system, sights, charging handles and bolt carrier group. Stripped AR-15 uppers consist of only the receiver housing allowing you to pick and choose the different components of your custom build. We carry upper receivers from all of the top brands - like Daniel Defense, Aero Precision, Alexander Arms and many more. Browse our curated online catalog of upper receivers and checkout our selection of guns parts & components to help complete your AR-15 build.
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  • Alexander Arms KIT50
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    Alexander Arms

    Alexander Arms KIT50 Upper Parts Kits 50 Beowulf 16 in Black Barrel, Aluminum Black Receiver for AR-15

    MPN:

    The 50 Beowulf DIY Upper Kit includes: 16" barrel with 1:20 twist, 49x64-20 tpi thread and thread protector; complete upper receiver; charging handle; gas block; dowel pins; gas tube; complete BCG wit…

    In Stock

    List: $825.95
    $577.95

    In Stock

    List: $825.95
    $577.95
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  • Aero Precision APAR308506AC M5E1 Enhanced Upper Receiver 308 Win 7075-T6 Aluminum Flat Dark Earth Cerakote Receiver for M5 Platform Aero Precision APAR308506AC M5E1 Enhanced Receiver 308 Win 7075-T6 Aluminum FDE Cerakote Receiver for M5 Platform
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    Aero

    Aero Precision APAR308506AC M5E1 Enhanced Receiver 308 Win 7075-T6 Aluminum FDE Cerakote Receiver for M5 Platform

    MPN:

    Aero's M5E1 Upper Receiver is a one-piece design combining the handguard mounting platform with the upper itself. Aero has condensed the parts needed to mount a free-floated handguard to 8 screws. It …

    In Stock

    List: $214.99
    $209.72

    In Stock

    List: $214.99
    $209.72
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  • Aero Precision APAR308554M45 AR-15 Enhanced Upper with M-Lok 6.5 Creedmoor 20" 416 Stainless Steel Threaded Stainless Steel Brl Finish
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    Aero

    Aero Precision APAR308554M45 M5E1 Enhanced Receiver 6.5 Creedmoor 20 in Stainless Steel Barrel, 7075-T6 Aluminum Black Anodized Receiver, Aero Gen2 Enhanced Handguard

    MPN:

    Aero's AR15 Enhanced Upper Complete Upper features an Aero Gen 2 Enhanced Handguard, quick disconnect sling sockets, enhanced milling design for grip and visual appeal, and a new profile for the picat…

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    $769.99

    In Stock

    $769.99
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  • ZEV Technologies UR556FOR Upper Receiver ZEV UR556FOR AR15 Forged Upper Receiver 223 Remington/5.56 NATO 7075-T6 Aluminum Black Hardcoat Anodized
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    ZEV Technologies

    ZEV UR556FOR AR15 Forged Upper Receiver 223 Remington/5.56 NATO 7075-T6 Aluminum Black Hardcoat Anodized

    MPN:

    ZEV Technologies Forged AR-15 Upper Receiver comes stripped and ready for your next custom AR build. The upper features a laser T marked Picatinny rail and M4 feed ramps with a standard cut. It is con…

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    List: $131.00
    Map Price Icon $128.38

    In Stock

    List: $131.00
    Map Price Icon $128.38
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  • Yankee Hill YHM-110 Upper Receiver Yankee Hill 110 Flat Top Upper Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15
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    Yankee Hill

    Yankee Hill 110 Flat Top Upper Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15

    MPN:

    The YHM Flat Top Upper Receiver is made from 7075-T6 aluminum (Forged) and has a hardcoat anodized matte black finish. It features M4 Style feed ramps and "T" Markings and the inside is coated with dr…

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    $107.00

    In Stock

    $107.00
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  • Nordic Components NC15-UR-EXT
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    Nordic Components

    Nordic Components NC15 Stripped Upper, Extruded, Fits AR15, Black Finish, Slick-side Upper, NC15-UR-EXT

    (1)

    MPN:

    Building a bench gun or varmint rifle? Have a 50-year old axe to grind with the military for insisting on a forward assist? Whatever the reason" Nordic's extruded upper provides an economical option …

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    List: $95.95
    $88.65

    In Stock

    List: $95.95
    $88.65
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  • Nordic Components 22RB-UPPER-16-KIT Nordic Components 22RB Upper, 22LR, 16 in Match Grade Barrel, 1:16 Twist, Black Finish, A2, 22RB-UPPER-16-KIT
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    Nordic Components

    Nordic Components 22RB Upper, 22LR, 16 in Match Grade Barrel, 1:16 Twist, Black Finish, A2, 22RB-UPPER-16-KIT

    MPN:

    Nordic Components' 22RB dedicated 22 upper receiver converts your standard AR-pattern lower to a dedicated .22LR for recreational shooting" training" and hunting. The 22RB is manufactured using the sa…

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    List: $610.00
    $549.19

    In Stock

    List: $610.00
    $549.19
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  • LBE Unlimited ARUPPER
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    LBE Unlimited

    LBE Unlimited ARUPPER Upper Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Receiver for AR-15 Includes Forward Assist

    MPN:

    The AR Upper Receiver comes with a Forward Assist and Ejection Port Cover Assembly Installed. It is forged from 7075-T6 Aluminum with a dry film lube interior. NOTE: Requires charging handle, barrel,…

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    List: $129.99
    $101.91

    In Stock

    List: $129.99
    $101.91
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  • Daniel Defense 23-128-02339-047
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    Daniel Defense

    Daniel Defense DDM4V7, Complete Upper, 223 Rem/556NATO, 16 in Cold Hammer Forged Barrel, 1:7 Twist, Black, MLOK 23-128-02339-047

    MPN:

    The Daniel Defense M4 V7 Upper Receiver Group is built around a Cold Hammer Forged 16" Government profile barrel and equipped with a DD improved Flash Suppressor to reduce flash signature. It features…

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    List: $1,214.00
    $1,174.00

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    List: $1,214.00
    $1,174.00
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  • Daniel Defense 23-004-13150
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    Daniel Defense

    Daniel Defense M4A1 Upper Receiver, 223 Rem/556NATO, 14.5 in Barrel (16 in OAL with Pinned Brake), Carbine Length Gas System, 1:7 Twist, M4 12.0 Rail, Flat Dark Earth Finish, Fits AR 23-004-13150

    MPN:

    The Daniel Defense M4A1 Upper Receiver Group features the M4A1 Rail Interface System (RIS II)" which has been in use by US Special Operations Command (SOCOM) for the SOPMOD II Weapons System since 200…

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    List: $1,499.00
    $1,450.00

    In Stock

    List: $1,499.00
    $1,450.00
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  • Black Rain Ordnance BRO-MUR-2 Black Rain Ordnance Milled Upper Receiver, 223 Rem/556NATO, Flat Top Sights, Black Finish BRO-MUR-2
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    Black Rain Ordnance

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

    MPN:

    Black Rain Ordnance" Inc. is a precision ?rearms manufacturer specializing in the modern sporting rifle design. Founded in 2009 with a benchmark to only manufacture weapons we would personally be prou…

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    List: $299.00
    $207.77

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    List: $299.00
    $207.77
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  • Chiappa 500095 Upper Receiver
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    Chiappa Firearms

    Chiappa 500095 M4-22 Gen II Pro Upper 22 LR 16 in Steel Barrel, Matte Black Polymer Receiver, 11.80 in Quad Picatinny Rail For Use With Mil-Spec Lower Receivers Includes 2 28rd Mags

    MPN:

    Just like the MFour-22 rifle, the Chiappa M4-22 Upper Receiver Kit takes advantage of AR platform dimensions and geometry. These upper receivers will fit on any MIL-SPEC lower receiver to create a .22…

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    List: $342.00
    $303.87

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    List: $342.00
    $303.87
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  • Chiappa 500093 Upper Receiver
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    Chiappa Firearms

    Chiappa 500093 M4-22 Gen II Pro Upper 22 LR 16 in Steel Barrel, Matte Black Polymer Receiver, 7.80 in Quad Picatinny Rail For Use With Mil-Spec Lower Receivers Includes 2 28rd, Magazines

    MPN:

    Just like the MFour-22 rifle, the Chiappa M4-22 Upper Receiver Kit takes advantage of AR platform dimensions and geometry. These upper receivers will fit on any MIL-SPEC lower receiver to create a .22…

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    List: $339.00
    $292.53

    In Stock

    List: $339.00
    $292.53
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  • Yankee Hill 110BILLET Upper Receiver
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    Yankee Hill

    Yankee Hill 110BILLET Billet Upper Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15

    MPN:

    The stylization of the YHM-110-BILLET was directly related to the stylization of the Billet lower which YHM finished first. It is crafted from 7075-T6 aluminum and has a hardcoat anodized matte black …

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    Map Price Icon $167.50

    In Stock

    Map Price Icon $167.50
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  • Spikes Tactical STU5435R2S Upper Receiver
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    Spikes Tactical

    Spikes STU5435R2S Complete Upper 5.56x45mm NATO 16 in Black /Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12 in SAR3 Handguard for AR-15

    MPN:

    The Spike's Tactical ST-15 Enhanced upper line-up is designed as a fully Mil-spec compliant upper series for law enforcement. This same level of quality and performance is now available to everyone, a…

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    List: $901.00
    Map Price Icon $788.40

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    List: $901.00
    Map Price Icon $788.40
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  • Spikes Tactical STU5435MLS Upper Receiver
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    Spikes Tactical

    Spikes STU5435MLS Complete Upper 5.56x45mm NATO 16 in Black /Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12 in SAR3 Handguard for AR-15

    MPN:

    The Spike's Tactical ST-15 Enhanced upper line-up is designed as a fully Mil-spec compliant upper series for law enforcement. This same level of quality and performance is now available to everyone, a…

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    List: $680.00
    Map Price Icon $630.00

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    List: $680.00
    Map Price Icon $630.00
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  • Spikes Tactical STU5035S2S Upper Receiver
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    Spikes Tactical

    Spikes STU5035S2S Complete Upper 5.56x45mm NATO 16 in Black /Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12 in SAR3 Handguard for AR-15

    MPN:

    The Spike's Tactical ST-15 LE upper line-up is designed as a fully Mil-spec compliant upper series for law enforcement. This same level of quality and performance is now available to everyone, all at …

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    List: $878.00
    Map Price Icon $790.20

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    List: $878.00
    Map Price Icon $790.20
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  • Spikes Tactical STU5025R9S Upper Receiver
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    Spikes Tactical

    Spikes STU5025R9S Complete Upper 5.56x45mm NATO 16 in Black Barrel, 7075-T6 Aluminum Black Receiver, 9 in BAR2 Free-Float Handguard for M4 Carbine

    MPN:

    The Spike's Tactical ST-15 LE upper line-up is designed as a fully Mil-spec compliant upper series for law enforcement. This same level of quality and performance is now available to everyone, all at …

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    List: $779.00
    Map Price Icon $743.40

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    List: $779.00
    Map Price Icon $743.40
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  • Spikes Tactical STU5025M4S Upper Receiver
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    Spikes Tactical

    Spikes STU5025M4S Complete Upper 5.56x45mm NATO 16 in Black Barrel, 7075-T6 Aluminum Black Receiver, M4 Double Head Shield Handguard for M4 Carbine

    MPN:

    The Spike's Tactical ST-15 LE upper line-up is designed as a fully Mil-spec compliant upper series for law enforcement. This same level of quality and performance is now available to everyone, all at …

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    Map Price Icon $835.00

    In Stock

    Map Price Icon $835.00
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  • Spikes Tactical SFT50M4 Upper Receiver Spikes SFT50M4 Flat Top Stripped Upper Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for M4 Platform
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    Spikes Tactical

    Spikes SFT50M4 Flat Top Stripped Upper Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for M4 Platform

    MPN:

    Spike's Tactical M4 flat top upper receiver is the same high quality M4 Mil-Spec upper used on their factory builds. This forged upper is constructed of 7075 T6 aluminum with a durable Type III Hardco…

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    List: $115.00
    Map Price Icon $103.50

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    List: $115.00
    Map Price Icon $103.50
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  • Bravo Company 4URM4 Upper Receiver
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    Bravo Company

    BCM 4URM4 BCM M4 Upper Assembly Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15

    MPN:

    Bravo's BCM M4 Upper Receiver Assembly is precision machined to correct Mil-Specs from 7075 T6 forgings extension, providing the user with superior strength when dropped or when mortaring malfunction …

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    $152.94

    In Stock

    $152.94
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  • Aero Precision APAR501801AC Assembled Upper Receiver Multi-Caliber 7075-T6 Aluminum Flat Dark Earth Cerakote Receiver for AR-15 Aero Precision APAR501801AC Assembled Receiver Multi-Caliber 7075-T6 Aluminum FDE Cerakote Receiver for AR-15
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    Aero

    Aero Precision APAR501801AC Assembled Receiver Multi-Caliber 7075-T6 Aluminum FDE Cerakote Receiver for AR-15

    (1)

    MPN:

    The AR15 Assembled Upper Receiver comes with the port door and forward assist already installed. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil- spec M16/M4 specificat…

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    List: $124.99
    $122.58

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    List: $124.99
    $122.58
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  • Aero Precision APAR501603AC Assembled Upper Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15 Aero Precision APAR501603AC Assembled Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15
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    Aero

    Aero Precision APAR501603AC Assembled Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15

    MPN:

    The AR-15 Assembled Upper receiver comes with the port door and forward assist already installed. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil-spec M16/M4 specificat…

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    List: $109.99
    $95.43

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    List: $109.99
    $95.43
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  • Aero Precision APAR501603C Stripped Upper Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15
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    Aero

    Aero Precision APAR501603C Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized for AR-15

    MPN:

    The AR-15 stripped upper receiver is one of Aero's most popular products. Forged from 7075-T6, this stripped upper is precision machined to mil-spec M16/M4 specifications and features M4 feedramps. M…

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    List: $89.99
    $87.12

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    List: $89.99
    $87.12
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  • Aero Precision APAR308505AC Assembled Upper Receiver 308 Win 7075-T6 Aluminum Flat Dark Earth Cerakote Receiver for M5 Platform Aero Precision APAR308505AC Assembled Receiver 308 Win 7075-T6 Aluminum FDE Cerakote Receiver for M5 Platform
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    Aero

    Aero Precision APAR308505AC Assembled Receiver 308 Win 7075-T6 Aluminum FDE Cerakote Receiver for M5 Platform

    MPN:

    The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware preinstalled. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept standard…

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    List: $184.99
    $178.27

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    List: $184.99
    $178.27
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  • Sold out
    Sons of Liberty EIC-16-CHF-556
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    Sons of Liberty

    Sons of Liberty Gun Works East India Starter Kit, Complete Upper Receiver, 556NATO, 16 in Barrel, Mid Length Gas System, Fits AR-15, QPQ Finish, Black EIC-16-CHF-556

    MPN:

    The East India Starter Kit is meant as a building block for any build you wish to do. It is built with Hidden high quality components. At Sons of Liberty Gun Works they always tell their customers" it…

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    List: $575.00
    Map Price Icon $546.25

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    List: $575.00
    Map Price Icon $546.25
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    Sons of Liberty EIC-14-5-CHF-556
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    Sons of Liberty

    Sons of Liberty Gun Works East India Starter Kit, Complete Upper Receiver, 556NATO, 14.5 in Barrel, Mid Length Gas System, Fits AR-15, QPQ Finish, Black EIC-14-5-CHF-556

    MPN:

    The East India Starter Kit is meant as a building block for any build you wish to do. It is built with Hidden high quality components. At Sons of Liberty Gun Works they always tell their customers" it…

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    List: $575.00
    Map Price Icon $546.25

    Out of Stock

    List: $575.00
    Map Price Icon $546.25
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More About 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 ramp. 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.