AR-15 300 Blackout 7.5" Pistol Build Kit (Unassembled) - Black
Sale

AR-15 300 Blackout 7.5" Pistol Build Kit (Unassembled) - Black

Shooters Gate
SKU:
AR-BDKT-U300-7.5HP8P-M7-BLK
$498.30 $299.00
(10 reviews)
Weight:
6.00 LBS
Current Stock:
174
Maximum Purchase:
3 units
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Description
- OVERVIEW -
This Shooters Gate AR-15 Build Kit provides a solid Mil-Spec foundation for a dependable 300 Blackout build. It includes a Stripped upper receiver, a 7.5” 300 Blackout barrel with a gas system (twist varies depending on the barrel), and a Black 7” free-float M-LOK handguard for stability and accessory mounting.

The kit also features a Bolt Carrier Group, made in the USA, standard charging handle, complete lower parts kit, and a Pistol buffer tube assembly. Only a stripped lower receiver and magazine are required to complete the build.
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Upper Assembly

Upper Receiver
Stripped upper receiver
Barrel
7.5” 300 Blackout barrel
(twist varies depending on the barrel)
Dust Cover & Forward Assist
  • Black dust cover
  • Black forward assist
Gas System
  • Gas Block (diameter varies depending on the barrel)
  • Gas Tube (length varies depending on the barrel)
Muzzle Device
A2 Bird Cage Flash Hider with crush washer
Handguard
Black M-LOK Free Float Handguard
For 7.5” Uppers there will be a 7” handguard
BCG & Charging Handle
  • Bolt Carrier Group, made in the USA
  • Black standard charging handle

Buffer System

Included Parts
Pistol Buffer Tube Buffer Spring Buffer Castle Nut End Plate

Lower Parts Kit

Included Parts
Safety Selector Safety Detent Safety Detent Spring Trigger Guard Trigger Guard Roll Pin Pistol Grip Washer Pistol Grip Screw Buffer Retainer Retaining Spring Mag Release Mag Release Button Mag Release Spring Takedown Pins (x2) Takedown Springs (x2) Takedown Detents (x2) Hammer Spring Hammer Pin Trigger Spring Trigger Pin Bolt Catch Bolt Catch Plunger Bolt Catch Spring Bolt Catch Roll Pin Disconnector Disconnector Spring Trigger Guard Screws Trigger Hammer AR-15 Pistol Grip

To Complete Your Build

What You Still Need
  • AR-15 Stripped Lower Receiver (FFL & Background Check required)
  • Magazine suitable for your desired caliber
⚠ WARNING: This product can expose you to chemicals such as lead and other petroleum products which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov

Reviews

  • 5
    Looks Good So Far

    Posted by Brandon K. on Mar 16th 2026

    Just got my 7.5" 300 Blackout kit in and everything looks good so far. Parts were packed nicely, finish looks clean, and I’m looking forward to getting it put together this weekend.

  • 5
    Solid Build — I will

    Posted by Jordan T. on Mar 12th 2026

    Solid Build — I will be building another shootersgate rifle soon!

  • 5
    Perfect

    Posted by Duwayne on Jan 4th 2026

    Great site. Exactly what I’m looking for.

  • 5
    easy installed

    Posted by Garret on Jan 4th 2026

    Very quick assembly and at the range the next day.

  • 5
    easy installed

    Posted by Garret on Jan 4th 2026

    Very quick assembly and at the range the next day.

  • 5
    Awesome

    Posted by Rick on Jan 4th 2026

    Awesome build. Great quality and reliable. Well made. Finish is great.

  • 5
    Fast shipping

    Posted by Mario on Jan 4th 2026

    Received everything as described. Fast shipping within 2 days. Happy customer

  • 5
    Great

    Posted by Jeremy on Dec 17th 2025

    I got a kit and put it together no problem. My buddies liked it so much they came and got a few kits from shootersgate as well. They all have nothing but good things to say about theirs too. One of the kits my buddy got even came with an adjustable gas block. How cool.

  • 5
    Great build kit, great quality.

    Posted by Cody irish on Dec 17th 2025

    10/10 would highly consider this build kit for anyone new and experienced! It was simple and so much fun to assemble!