AR Upper Receivers
Shop Ballistic Barn AR upper receivers for custom AR-15 and AR-10 builds, including stripped and assembled receiver configurations. The upper receiver provides the foundation for the barrel, handguard and other components that make up an AR upper assembly.
Our selection includes AR-15 upper receivers, AR-10 upper receivers, stripped receivers, assembled receivers and specialized receiver configurations for standard and big-bore builds. Choose the receiver that matches your platform and components before completing the rest of your upper.
AR Upper Receivers for Custom Builds
An AR upper receiver is the central receiver component used as the foundation of an upper assembly. Ballistic Barn carries upper receivers for both AR-15 and AR-10-pattern builds, with options ranging from stripped receivers to assembled receiver configurations.
Unlike an assembled or barreled upper, a standalone upper receiver does not include the barrel, handguard, gas system and other major components that make up a finished upper assembly. This makes the receiver a starting point for builders who want to select the individual components used throughout their build.
AR-15 and AR-10 Upper Receivers
AR upper receivers are platform-specific. Choose the receiver family that matches the other components intended for your build rather than assuming AR-15 and larger-frame AR components are interchangeable.
AR-15 Upper Receivers
AR-15 upper receivers provide the receiver foundation for small-frame AR builds. Our selection includes receiver configurations for standard AR-15 applications as well as specialized options for compatible big-bore builds.
AR-10 Upper Receivers
AR-10 and .308-pattern upper receivers are intended for large-frame builds. Large-frame AR components can vary by pattern and manufacturer, so receiver and component compatibility should be verified before purchasing parts.
Stripped vs. Assembled Upper Receivers
Upper receivers are commonly offered in stripped and assembled configurations. The difference refers to the receiver-specific components included with the receiver, not whether the receiver is a complete barreled upper assembly.
Stripped Upper Receiver
A stripped upper receiver is primarily the receiver body itself.
It provides a starting point for a custom build and allows the
builder to select the compatible receiver components and other
upper parts separately.
Assembled Upper Receiver
An assembled upper receiver includes certain receiver-specific
components already installed, depending on the model. It remains
a standalone upper receiver and should not be confused with an
assembled, barreled or complete upper.
Big-Bore Upper Receiver
Some AR-15 upper receivers are configured for cartridges that
require additional clearance or other caliber-specific receiver
considerations. Verify that the receiver is appropriate for the
caliber and components planned for the build.
Large-Frame Upper Receiver
AR-10 and .308-pattern upper receivers are larger-frame
components and should not be treated as interchangeable with
standard AR-15 receivers. Compatibility can also vary among
different large-frame patterns.
Choosing an AR Upper Receiver
Start by identifying the platform and component family for the build. From there, consider whether you want a stripped or assembled receiver, the intended caliber, receiver configuration and compatibility with the other parts you plan to use.
Match the Receiver to the Platform
AR-15 and AR-10-pattern receivers belong to different platform families. For large-frame builds in particular, confirm compatibility between the upper receiver, lower receiver and other major components because dimensions and patterns can vary.
Consider the Intended Caliber
The intended cartridge can affect other components selected for the upper and, in some applications, the receiver configuration itself. Standard and big-bore AR-15 builds may have different requirements, so check the specifications of the receiver and related components before purchasing.
Decide Between Stripped and Assembled
A stripped receiver gives you greater control over the individual receiver components selected for the project. An assembled receiver can simplify component selection by including certain receiver-specific parts with the receiver.
Shop Related AR Upper Parts
An upper receiver is only one component of an upper assembly. Ballistic Barn carries additional AR parts for customers selecting components for a custom build.
AR Barrels
Browse barrels by caliber, length, profile and other specifications.
Handguards and Rails
Compare handguard lengths and configurations for compatible upper builds.
Gas Blocks
Shop fixed and adjustable gas-block options for compatible barrel and gas-system configurations.
Bolt Carrier Groups
Browse BCG options and verify compatibility with the selected platform, barrel and caliber.
Charging Handles
Compare standard and upgraded charging-handle configurations.
Muzzle Devices
Browse compatible muzzle devices for different barrels, thread patterns and applications.
Upper Receiver or Assembled Upper?
The products in this category are upper receiver components intended for customers selecting parts for a build. An upper receiver by itself should not be confused with an assembled upper that already includes a barrel, handguard, gas system and other major components.
Looking for an AR-15 Upper Instead?
If you want an assembled, barreled upper rather than a standalone receiver component, browse our AR-15 Uppers . Complete upper configurations include a compatible BCG and charging handle when specified.
AR Upper Receiver FAQs
What is an AR upper receiver?
An AR upper receiver is the central receiver component used as the foundation of an upper assembly. Other major upper components are selected to match the receiver, platform and intended caliber.
What is the difference between an upper receiver and an AR upper?
An upper receiver is the individual receiver component. An assembled AR upper contains the receiver along with major components such as the barrel, handguard and gas system. The terms describe different levels of assembly and should not be treated as interchangeable.
What is a stripped upper receiver?
A stripped upper receiver is primarily the receiver body without the major components that make up an assembled upper. It is intended as a starting component for a custom upper build.
What is an assembled upper receiver?
An assembled upper receiver includes certain receiver-specific components already installed, depending on the product. It is still a receiver component rather than a complete barreled upper assembly.
Are AR-15 and AR-10 upper receivers interchangeable?
No. AR-15 and AR-10-pattern receivers belong to different platform families. Large-frame AR patterns can also differ from one another, so compatibility with the lower receiver and other components should be confirmed before ordering.
Are all AR-10 and 308 upper receivers interchangeable?
No. Unlike the more standardized AR-15 platform, large-frame AR systems can vary in receiver pattern and dimensions. Compatibility should be confirmed between the upper receiver, lower receiver and other major components intended for the build.
Do big-bore AR-15 builds require a special upper receiver?
Some big-bore configurations can have receiver-specific requirements or benefit from receivers designed for additional clearance. Check the specifications of the receiver and the requirements of the intended caliber before selecting components.
Does an upper receiver include a barrel?
A standalone upper receiver does not include a barrel unless a particular product listing explicitly states otherwise. The upper receivers in this category are receiver components rather than assembled barreled uppers.