Uppers

Uppers, also known as upper receivers, are a significant component of AR-15 rifles. They attach to the lower receiver and house the bolt carrier group, barrel, and other crucial parts of the firearm. As a crucial part of the AR-15 platform, uppers play a vital role in determining the rifle's performance and capabilities. AR15-Overstock.com offers a wide selection of AR-15 upper receivers, including complete uppers, stripped uppers, and individual upper parts. From different calibers and barrel lengths to various handguard options, finding the right upper for your AR-15 build is crucial for achieving your desired shooting experience.

AR15-Upper Receivers - AR15-Overstock.com

  • 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 $215.00
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  • AR15 Upper Assembly /16" 300AAC /12" Handguard/1:8/M-Lock/160-001

    AR15 Upper Assembly /16" 300AAC /12" Handguard/1:8/M-Lock/160-001

    This AR-15 upper assembly is made from the highest quality parts and is assembled in Charleston, South Carolina. The 12″ M-LOK design is one of our most popular handguard/rail designs. Features: 7075-T6 Aluminum Mil-Spec Anodized Receiver Pistol...

    Was: $419.00
    On Sale $269.00
  • 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 $215.00
  • AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / 160-819 White

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / 160-819 White

    The AR15 Pistol Upper Assembly in White offers exceptional quality and performance. This 5 barrel assembly is chambered in 5.56 NATO with a 1:5 twist rate, ensuring optimal accuracy and stability. The sleek white finish adds a modern touch to your...

    Was: $389.00
    On Sale $239.00
  • AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / 160-819 Slime Green

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / 160-819 Slime Green

    This MICRO AR15 upper receiver assembly comes ready to attach to any Mil-Spec lower receiver. The receiver is a flat top M4 forged Mil-Spec upper receiver that is CNC Machined from 7075-T6 aluminum – the hardest and most durable material of any...

    Was: $389.00
    On Sale $239.00
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