Pistol Uppers

Pistol uppers are a key component in building a compact and versatile AR-style pistol. Designed to attach seamlessly to a pistol lower receiver, these uppers house the barrel, bolt carrier group, and other essential parts that define your firearm’s performance. The shorter barrel length makes pistol uppers ideal for lightweight builds, maneuverability, and close-range use, without sacrificing reliability.

At AR15-Overstock.com, we carry a wide range of AR pistol uppers, to suit any build preference. From micro 5-inch uppers for ultra-compact designs to longer pistol-length options, our inventory includes multiple calibers, handguard styles, and finishes. Whether you’re customizing a personal defense pistol or building a unique range setup, finding the right pistol upper is essential to creating the performance and handling you want.

Shop high-quality pistol uppers today at AR15-Overstock.com and take the first step toward your ideal AR pistol build.

  • AR15 Pistol Upper Assembly / 5 inch 300 AAC / 1:5 / 160-820, black metal firearm upper receiver with warning label, skull logo, and warning switch.

    AR15 Pistol Upper Assembly / 5" 300 AAC / 1:5 / 160-820 Beware

    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: $359.00
    On Sale $219.00
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  • AR15 Pistol Upper Assembly, 5" 5.56 Nato, ANODIZED SILVER, firearm component with black and silver finish, long barrel with muzzle device, accessory tools for installation.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / ANODIZED SILVER

    Upgrade your build with the AR15 Pistol Upper Assembly / 5" 5.56 NATO / 1:5 / Anodized Silver. This compact upper is built for reliable performance in micro AR pistol setups. Featuring a 5" barrel chambered in 5.56 NATO with a 1:5 twist rate, it delivers...

    Was: $389.00
    On Sale $230.00
  • AR15 Pistol Upper Assembly / 5" 5.56 Nato / ANODIZED BLUE, firearm upper receiver with blue anodized finish and parts.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / ANODIZED BLUE

    Upgrade your build with the AR15 Pistol Upper Assembly / 5" 5.56 NATO / 1:5 / Iodized Blue. This compact upper is built for reliable performance in micro AR pistol setups. Featuring a 5" barrel chambered in 5.56 NATO with a 1:5 twist rate, it delivers...

    Was: $389.00
    On Sale $230.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 5-inch 5.56 Nato, Anodized Bronze, with barrel, handguard, and muzzle device.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / ANODIZED BRONZE

    Upgrade your build with the AR15 Pistol Upper Assembly / 5" 5.56 NATO / 1:5 / Iodized Bronze. This compact upper is built for reliable performance in micro AR pistol setups. Featuring a 5" barrel chambered in 5.56 NATO with a 1:5 twist rate, it delivers...

    Was: $389.00
    On Sale $230.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 5-inch 5.56 NATO, anodized purple finish with included purple handguard and muzzle device.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / ANODIZED PURPLE

    Upgrade your build with the AR15 Pistol Upper Assembly / 5" 5.56 NATO / 1:5 / Purple. This compact upper features a 5" barrel with a 1:5 twist rate for reliable performance in micro setups. Finished in a bold purple color, it adds standout style to your...

    Was: $389.00
    On Sale $230.00
  • AR15 Pistol Upper Assembly, 5-inch 5.56 Nato, anodized red finish, with charging handle and muzzle brake

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / ANODIZED RED

    Enhance your AR-15 pistol with the AR15 Pistol Upper Assembly / 5" 5.56 NATO / 1:5 / Red. Built for performance and durability, this compact upper is ideal for shooters looking for a powerful, space-saving setup. Featuring a 5" barrel chambered in 5.56...

    Was: $389.00
    On Sale $230.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 4-inch 9mm, Black, with Blast Can America branding.

    AR15 Pistol Upper Assembly / 4" 9mm / BLAST CAN AMERICA 160-500

    Tactical Precision: 4" 9mm AR-15 Upper with Flush Blast Can Compact, patriotic, and built for performance. This 4" 9mm complete upper receiver is the ultimate solution for shooters building a high-speed PDW or a discreet backpack pistol. It features a...

    Was: $359.00
    On Sale $209.00
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