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, 4-inch 9mm firearm component with rail system and black finish.

    AR15 Pistol Upper Assembly / 4" 9mm / 160-499

    This AR15 upper receiver assembly comes ready to attach to any Mil-Spec lower receiver. It is built around a 4 inch, 4150 chrome moly barrel and has a black nitride finish. The upper receiver is a forged M4 flat top upper, allowing you to easily attach...

    Was: $359.00
    On Sale $190.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 5 inch 5.56 Nato with American flag design, showcasing a black finish and tactical features.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / American Flag

    Upgrade your AR15 with our high-performance 5" 5.56 NATO Pistol Upper Assembly, built for compact power and reliable performance. This micro-length upper is designed for durability and precision, making it a great option for close-quarters setups and...

    Was: $359.00
    On Sale $195.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 7.5 inch 5.56 Nato, 1:5 twist, silver finish, firearm accessory with handguard and barrel.

    AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:5 / 160-829 Silver

    Enhance your AR15 pistol with the AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:7 / 160-829 Silver. This premium upper assembly is designed for optimal performance and durability. The 7.5 barrel is chambered in 5.56 Nato with a 1:7 twist rate, ensuring...

    Was: $399.00
    On Sale $249.00
  • AR15 Pistol Upper Assembly, 5-inch 7.62x39 caliber, with 1:10 twist rate, model 160-819, black metallic finish, includes barrel and handguard

    AR15 Pistol Upper Assembly / 5" 7.62x39 / 1:10 / 160-819

    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
  • AR15 Pistol Upper Assembly, 5" 5.56 Nato, 1:5, 160-819 Orange, gun upper receiver with orange handguard and compatible tools included.

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

    Enhance your AR15 pistol with the AR15 Pistol Upper Assembly / 5 5.56 Nato / 1:5 / 160-819 Orange. This premium upper assembly is designed for optimal performance and durability. The 5 barrel is chambered in 5.56 Nato with a 1:5 twist rate, ensuring...

    Was: $389.00
    On Sale $239.00
  • AR15 Pistol Upper Assembly, 5 inch 5.56 Nato, with gold and black finish, featuring a sleek design and precision construction.

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

    Enhance your AR15 pistol with the AR15 Pistol Upper Assembly / 5 5.56 Nato / 1:5 / 160-819 Red. This premium upper assembly is designed for optimal performance and durability. The 5 barrel is chambered in 5.56 Nato with a 1:5 twist rate, ensuring...

    Was: $389.00
    On Sale $239.00
    Add to Cart
  • AR-15 5.56 NATO 5'' - BILLET UPPER WITH 4'' HANDGUARD/ 160-830, black rifle upper with a custom American flag and star pattern, featuring a rail for mounting accessories.

    AR-15 5.56 NATO 5'' - BILLET UPPER WITH 4'' HANDGUARD/ 160-830

    Kit cannot be changed, no modifications will be accepted • This is NOT a FFL item. Left Side Charging Handle Includes: 5.56 NATO PISTOL 5" INCH PISTOL LENGTH BARREL 1:5 5R TWIST - BLACK NITRIDE (MADE IN USA) AR-15/47/9/300 Custom Lightweight Side...

    $330.00 - $400.00
  • AR15 Pistol Upper Assembly / 7.5 inch 5.56 Nato / 1:5 / 160-829, black, tactical firearm component with handguard and barrel

    AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:5 / 160-829

    Enhance your AR15 pistol with the AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:7 / 160-829. This premium upper assembly is designed for optimal performance and durability. The 7.5 barrel is chambered in 5.56 Nato with a 1:7 twist rate, ensuring...

    Was: $379.00
    On Sale $219.00
    Add to Cart
  • AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:5 / 160-829 Red, firearm parts with a black upper receiver and red accents, including a silencer tip and a T-handle tool.

    AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:5 / 160-829 Red

    Enhance your AR15 pistol with the AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:7 / 160-829 Red. This premium upper assembly is designed for optimal performance and durability. The 7.5 barrel is chambered in 5.56 Nato with a 1:7 twist rate, ensuring...

    Was: $399.00
    On Sale $249.00
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