At 3CR Tactical, we take pride in offering a diverse selection of AR assembled upper receivers designed to meet the needs of gun owners, whether you’re building a custom AR or upgrading your current setup. With free shipping on all orders, we make it easy to find and receive the components you need without breaking the bank. Explore our lineup to discover why we’re a trusted name in AR parts and accessories.
An AR assembled upper receiver is the heart of your rifle’s upper assembly, combining the essential components needed to complete your firearm. Unlike stripped uppers, our assembled receivers come pre-installed with key elements like barrels, handguards, and sometimes bolt carrier groups (BCG) and charging handles. This means less time building and more time shooting. Our upper receivers are expertly crafted for compatibility, durability, and performance, ensuring you have a reliable platform for any shooting application.
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One of the first decisions to make when choosing an AR assembled upper receiver is selecting the right caliber. At 3CR Tactical, we offer a wide range of options to suit various needs:
The 5.56 NATO is a tried-and-true caliber known for its versatility and reliability. Whether you’re targeting small game or hitting the range for recreational shooting, our 5.56 NATO uppers deliver consistent performance. These uppers are compatible with a wide selection of lower receivers and are properly staked for durability.
For shooters who prioritize accuracy, the .223 Wylde chamber bridges the gap between 5.56 NATO and .223 Remington. This caliber offers exceptional precision, making it an excellent choice for competitive shooting or precision target practice.
If you need a caliber optimized for suppressed shooting or close-range power, the .300 AAC Blackout is a top contender. It’s a favorite among hunters and those building AR pistols. These uppers are designed with different gas systems to ensure optimal performance.
For those looking to combine the AR platform with the affordability of AK-47 ammunition, the 7.62x39 chamber is an excellent option. This caliber is ideal for budget-conscious shooters who don’t want to compromise on performance. Our uppers include robust components like billet upper receivers to handle the recoil.
The .308 Winchester is perfect for long-range shooting and hunting larger game. Our .308 assembled uppers are designed with durability and accuracy in mind, giving you confidence when precision matters most. These assemblies are precision machined for accuracy and include ejection ports designed for reliability.
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Choosing the right barrel length for your AR assembled upper receiver depends on how you intend to use your firearm. At 3CR Tactical, we provide options for various shooting styles and preferences. Our barrel lengths range from compact designs to long-range precision options.
Our short barrels, available in sizes like 7.5" and 10.5", are perfect for AR pistol builds. These compact uppers provide excellent maneuverability, making them ideal for home defense and close-quarters applications. They feature properly installed gas systems to ensure reliable cycling.
For those building a traditional rifle, our 16" barrels deliver a great balance of accuracy, velocity, and ease of handling. This standard length is versatile enough for recreational shooting, hunting, and tactical use.
When long-range accuracy is your goal, our 20" and 24" barrels are up to the task. These lengths optimize bullet velocity and stability, ensuring tight groupings at extended distances. The material used in these barrels, combined with their specifications, ensures consistent performance.
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The handguard is a key component of any AR assembled upper receiver, impacting both functionality and aesthetics. At 3CR Tactical, we offer multiple handguard options to fit your preferences and shooting needs. Each handguard is manufactured to mil spec standards for compatibility with AR 15 upper receivers.
M-LOK handguards provide a lightweight, modular solution for attaching accessories like lights, lasers, and grips. They’re a favorite among shooters who value customization and versatility. These handguards enhance durability while reducing weight.
KeyMod handguards offer a sleek, low-profile design with reliable accessory mounting. They’re ideal for those seeking a clean, functional look. Each design is manufactured with quality control in mind.
For those who prefer a classic appearance, our A2-style handguards deliver traditional styling with rugged durability. These are perfect for retro builds or those who value simplicity.
Our AR assembled upper receivers come in configurations to suit any builder, whether you want a complete setup or prefer to add your own finishing touches. These include individual components like forward assists, bolt carrier groups, and charging handles.
For maximum convenience, choose one of our uppers that includes a bolt carrier group and charging handle. These are ready to attach to your lower receiver for instant use. Our complete upper receivers are designed to stand up to rigorous use and are hardcoat anodized for added durability.
If you already have a BCG and charging handle or want to select specific components, we also offer assembled uppers without these parts, giving you greater flexibility. These allow for full customization and compatibility with AR15 upper receiver standards.
At 3CR Tactical, we know that the little details make a big difference. That’s why our AR assembled upper receivers include features that enhance performance and reliability. From aero precision engineering to properly staked gas key systems, we ensure quality.
Our fluted bull barrels are designed to improve heat dissipation and reduce weight while maintaining exceptional accuracy. They’re perfect for precision shooters who demand consistent results. These barrels are manufactured with strict quality control measures.
For a secure and reliable sighting system, our uppers with pinned FSBs provide a classic and durable solution. These are ideal for shooters who value a robust, fixed sight setup. The design integrates seamlessly with iron sights and other optics.
Free-float handguards eliminate contact with the barrel, enhancing accuracy by reducing barrel vibration. This feature is especially valuable for long-range and competitive shooting. These are installed with precision to ensure proper function.
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At 3CR Tactical, we’re not just selling AR parts—we’re providing solutions backed by expertise and quality. Here’s why gun owners trust us for their AR assembled upper receiver needs:
When it comes to building or upgrading your AR, the right upper receiver is key. At 3CR Tactical, we’re committed to providing top-notch AR assembled upper receivers that deliver reliability, accuracy, and performance. Explore our inventory today and experience the difference that quality craftsmanship and exceptional service can make.
