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 5.56 Nato / 1:5 twist rate with spider web design.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / Spider

    MICRO AR15 5" Assembled Upper Receiver — 5.56 NATO Built for reliability, compact performance, and a little seasonal flair. This MICRO AR15 upper receiver assembly arrives fully assembled and ready to drop onto any Mil-Spec lower. Key...

    Was: $339.00
    On Sale $199.00
  • AR15 Pistol Upper Assembly / 5 inch 5.56 Nato / 1:5 / Zombie, black firearm upper receiver with extended rail, barrel and collapsible stock, Zombie Response Team branding.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / Zombie

    MICRO AR15 5" Assembled Upper Receiver — 5.56 NATO Built for reliability, compact performance, and a little seasonal flair. This MICRO AR15 upper receiver assembly arrives fully assembled and ready to drop onto any Mil-Spec lower. Key...

    Was: $339.00
    On Sale $215.00
  • AR15 Pistol Upper Assembly, 5-inch 5.56 Nato, 1:5 twist rate with Halloween-themed witch design

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / Witch

    MICRO AR15 5" Assembled Upper Receiver — 5.56 NATO Built for reliability, compact performance, and a little seasonal flair. This MICRO AR15 upper receiver assembly arrives fully assembled and ready to drop onto any Mil-Spec lower. Key...

    Was: $339.00
    On Sale $199.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 5-inch 5.56 NATO / 1:5 twist, Pumpkin design.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / PUMPKIN

    MICRO AR15 5" Assembled Upper Receiver — 5.56 NATO Built for reliability, compact performance, and a little seasonal flair. This MICRO AR15 upper receiver assembly arrives fully assembled and ready to drop onto any Mil-Spec lower. Key...

    Was: $339.00
    On Sale $199.00
    Add to Cart
  • AR15 Pistol Upper Assembly, 5-inch 5.56 NATO, 1:5 twist, Stay Spooky themed tactical firearm parts.

    AR15 Pistol Upper Assembly / 5" 5.56 Nato / 1:5 / STAY SPOOKY

    MICRO AR15 5" Assembled Upper Receiver — 5.56 NATO Built for reliability, compact performance, and a little seasonal flair. This MICRO AR15 upper receiver assembly arrives fully assembled and ready to drop onto any Mil-Spec lower. Key...

    Was: $339.00
    On Sale $199.00
  • 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
    Choose Options
  • 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: $319.00
    On Sale $229.00
    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: $339.00
    On Sale $239.00
    Add to Cart
  • AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:5 / 160-829 ODG, black and olive green rifle upper assembly with handguard, barrel, and charging handle isolated on white background.

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

    Enhance your AR15 pistol with the AR15 Pistol Upper Assembly / 7.5" 5.56 Nato / 1:7 / 160-829 ODG. 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: $339.00
    On Sale $239.00
    Add to Cart
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