Rifle Uppers

Rifle uppers are an essential component of any AR-15 build, providing the foundation for accuracy, reliability, and overall performance. Designed to connect directly with your rifle lower receiver, these uppers house the barrel, bolt carrier group, and other critical parts that define how your rifle shoots. With longer barrel lengths than pistol uppers, rifle uppers are perfect for precision shooting, hunting, and long-range performance while maintaining the trusted versatility of the AR platform.

At AR15-Overstock.com, we offer a wide selection of AR rifle uppers, including complete assemblies, stripped uppers, and individual upper parts. Our inventory features a variety of barrel lengths, calibers, and handguard styles to help you build the exact rifle you want. Whether you’re upgrading an existing rifle or starting a brand-new build, the right rifle upper makes all the difference.

Shop top-quality rifle uppers today at AR15-Overstock.com and build with confidence.

  • Upper Assembly /16" 9mm /1:10/M-Lock/160-053, black firearm upper assembly with M-Lock rail system and detailed component design.

    Upper Assembly /16" 9mm /1:10/M-Lock/160-053

    This AR-15 upper assembly is made from the highest quality parts and is assembled in Charleston, South Carolina. The 15" M-LOK design is one of our most popular handguard/rail designs. Features: 7075-T6 Aluminum Mil-Spec Anodized Receiver 16" 9mm Barrel...

    Was: $419.00
    On Sale $259.00
    Add to Cart
  • Upper Mystery Box

    Upper Mystery Box

    Unveil the ultimate thrill with our Upper Assembly Mystery Box! Packed with premium treasures, this curated collection elevates the mystery experience. Expect higher-value items, exclusive finds, and a touch of luxury in every unboxing. Perfect for...

    $149.00
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  • Upper Assembly /16" 7.62x39 /1:10/M-Lock/160-052

    Upper Assembly /16" 7.62x39 /1:10/M-Lock/160-052

    This AR-15 upper assembly is made from the highest quality parts and is assembled in Charleston, South Carolina. The 15" M-LOK design is one of our most popular handguard/rail designs. Features: 7075-T6 Aluminum Mil-Spec Anodized Receiver Carbine Length...

    Was: $419.00
    On Sale $249.00
    Add to Cart
  • AR15 Upper Assembly /16" 5.56 Nato /1:8/M-Lock/160-734

    AR15 Upper Assembly /16" 5.56 Nato /1:8/M-Lock/160-734

    Barrel:16″ 5.56 Nato Melonite Barrel Chrome Moly Twist Rate: 1/8 Feed Ramps: M4 Gas Block: Steel .750 Low Profile Gas Tube: DGI Stainless Carbine-Length Muzzle Device: A2 Rail: either 15″ CBC M-Lok free float rail system Upper Receiver:...

    Was: $419.00
    On Sale $249.00
    Add to Cart
  • CPF Upper Assembly /18" 6.5 Grendel /1:8/M-Lock/160-081

    CPF Upper Assembly /18" 6.5 Grendel /1:8/M-Lock/160-081

    The Grendel 6.5 is a capable mid-size hunting caliber with ample power to take down almost anything you will venture across. This upper assembly has the perfect balance of weight, size, and power. Whether you’re tracking wild game through thick...

    Was: $419.00
    On Sale $249.00
    Add to Cart
  • AR15 Upper Assembly /16" 300AAC /1:8/15" M-Lock/160-051

    AR15 Upper Assembly /16" 300AAC /1:8/15" M-Lock/160-051

    This AR-15 upper assembly is made from the highest quality parts and is assembled in Charleston, South Carolina. The 15″ CBC Arms M-LOK design is one of our most popular handguard/rail designs. Features: 7075-T6 Aluminum Mil-Spec Anodized Receiver...

    Was: $419.00
    On Sale $249.00
    Add to Cart
  • AR15 Upper Assembly /18" 6.5 Grendel /12" M-Lock/1:8/160-263

    AR15 Upper Assembly /18" 6.5 Grendel /12" M-Lock/1:8/160-263

    The Grendel 6.5 is a capable mid-size hunting caliber with ample power to take down almost anything you will venture across. This upper assembly has the perfect balance of weight, size, and power. Whether you’re tracking wild game through thick...

    Was: $419.00
    On Sale $249.00
    Add to Cart
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