AR-15 300 Blackout 10.5″ Pistol Upper Complete Build Kits (Unassembled Black Barrel Upper) – Purple

Shooters Gate
SKU:
AR-BDKT-U300-10.5P8C-M10-PP
$485.99
(1 review)
Weight:
6.00 LBS
Current Stock:
Adding to cart… The item has been added
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300 Blackout 10.5
AR-15 300 Blackout 10.5" Pistol Upper Complete Build Kits
$251.19
Best price in cart

AR-15 Unassembled Pistol Build Kit

Shooters Gate proudly offers the AR-15 Unassembled Pistol Build Kit for builders who want hands-on control over their pistol build. This kit includes nearly all the essential components needed to assemble a reliable AR-15 pistol, while allowing you to customize the final setup to your preferences.

Designed for builders who value quality, compatibility, and flexibility, this kit is ideal for first-time builders and experienced AR enthusiasts alike.

Unassembled Upper Receiver Components

Each kit includes a fully unassembled upper with the following components:

  • Black forged 7075-T6 mil-spec stripped upper receiver
  • 10.5″ .300 Blackout barrel
  • Black or matched-color dust cover
  • Black or matched-color forward assist
  • Gas block (diameter varies by barrel)
  • Gas tube (length varies by barrel)
  • A2 birdcage flash hider with crush washer
    (California-compliant uppers will include a round muzzle brake)
  • Parkerized or stainless steel muzzle device to match barrel material
  • Black or matched-color M-LOK free-float handguard
  • 10″ handguard included with 10.5″ uppers
  • Full-auto bolt carrier group (Made in USA)
  • Black standard charging handle

Twist Rate

Caliber Twist Ratio
300 Blackout 1:8 Twist

Lower Receiver Components

The lower components included in this kit provide the essential hardware required for your pistol configuration:

  • Black lower parts kit
  • Black pistol buffer tube
  • Black castle nut
  • Black end plate
  • Black pistol tube foam
  • Buffer spring
  • Buffer

What You Still Need To Complete Your Build

You’re almost finished. To complete your AR-15 Unassembled Pistol Build Kit, you will still need:

  • An AR-15 stripped lower receiver
    (FFL transfer and background check required)
  • A magazine appropriate for your selected caliber

California Proposition 65 Warning

WARNING: This product can expose you to chemicals including lead and other petroleum-based substances, which are known to the State of California to cause cancer, birth defects, or other reproductive harm.

For more information, visit: https://www.p65warnings.ca.gov

Reviews

  • 5
    Good!!!

    Posted by Michael Chen on Jan 4th 2026

    Build quality is really good. Exactly what I expected.