AR-15 300 Blackout 16" Rifle Build Kit (Unassembled) - Black
Sale

AR-15 300 Blackout 16" Rifle Build Kit (Unassembled) - Black

Shooters Gate
SKU:
AR-BDKT-U300-16P8HP-M15-BLK
$498.30 $299.00
(12 reviews)
Weight:
7.00 LBS
Current Stock:
170
Maximum Purchase:
3 units
Adding to cart… The item has been added
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 16“ 300 Blackout barrel with a gas system (twist varies depending on the barrel), and a Black 15“ 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 Mil-Spec buffer tube assembly. Only a stripped lower receiver and magazine are required to complete the build.
Show More ▼

Upper Assembly

Upper Receiver
Stripped upper receiver
Barrel
16“ 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 16“ Uppers there will be a 15“ handguard
BCG & Charging Handle
  • Bolt Carrier Group, made in the USA
  • Black standard charging handle

Buffer System

Included Parts
Mil-Spec Stock Mil Spec 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
    Great

    Posted by Thomas on Jan 4th 2026

    Great shipping, great service these guys are fabulous. ordered my first build , and just ordered another for the wife, our son just ordered one.

  • 5
    Perfect

    Posted by Matthew on Jan 4th 2026

    Great site. Exactly what I’m looking for.

  • 5
    Awesome price

    Posted by Rudy on Dec 17th 2025

    Great product and all parts very durable. Awesome price and highly recommended!