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

Shooters Gate
SKU:
AR-BDKT-U300-16P8HP-M15-BLK
$475.99 $259.19
(12 reviews)
Weight:
7.00 LBS
Current Stock:
180
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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 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.
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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
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Reviews

  • 5
    300 blackout

    Posted by Ralph Moss on Mar 31st 2026

    Everything went together great except the charging handle didn’t fit properly and I had to use a punch to get it to fit into the grove , not sure how I will ever get it back out and it was missing the buffer retainer spring, other then that I am happy with it and plan on getting another build kit soon. Thanks

  • 5
    Really fast shipping.

    Posted by Chris on Mar 24th 2026

    Really nice end product.

  • 5
    Nice

    Posted by Dave on Mar 24th 2026

    Really nice end product. Really fast shipping. Loved the parts that came with the kit

  • 5
    Good Value for the Price

    Posted by Chris T. on Mar 16th 2026

    Got the AR-15 300 Blackout 16" kit and it feels like a really good value for the price. Looks solid, priced right, and overall I’m happy with it.

  • 5
    Just Got It Today

    Posted by Tyler S. on Mar 16th 2026

    Just got my AR-15 300 Blackout 16" Rifle Upper Complete Build Kit today and everything looks really good out of the box. The finish looks clean, parts were packed well, and so far I’m impressed. Haven’t put it together yet, but I’m definitely looking forward to the build this weekend.

  • 5
    Going to be a fun build

    Posted by Doug Hazzard on Feb 15th 2026

    Great quality

  • 5
    Easy build, no issues

    Posted by Jason on Jan 20th 2026

    Clean finish, no missing parts, and fast shipping. Very happy with this build kit.

  • 5
    Great value

    Posted by Michael on Jan 20th 2026

    Parts fit well, finish looks clean, and everything assembled without issues. Shipping was fast and ShootersGate support was responsive. Would definitely buy again.

  • 5
    Perfect

    Posted by Chris on Jan 4th 2026

    I bought this kit back in October and I ran 500 rounds through it without a hiccup