Lifetime Warranty Lifetime Warranty Made in the USA Made in the USA FREE Shipping on $325+ Free Shipping on all orders $325+!
80% L❂WERS

Featured Product: 300 Blackout AR 15 Rifle Kit (16″ Nitride Barrel) w/ 80% Lower

Featured Product - 300 Blackout AR 15 Rifle Kit (16in. Nitride Barrel) + 80 Lower - Title Image

300 Blackout uppers have taken the AR-15 market by storm. You might’ve heard why 300 Blackout is so awesome, but If you haven’t, take a look here: We found the top four reasons why folks like building rifles chambered in 300 BLK, and why you should consider it yourself. Are you ready to start slingin’ supersonic and subsonic rounds down-range?? Check out our customers’ favorite 300 Blackout upper: The 16” nitride barrel- and fixed A2 front sight-equipped 300 Blackout AR 15 Rifle Kit, complete with a forged 80% Lower!

The 300 Blackout AR 15 Rifle Kit (16” Nitride Barrel & Fixed Front Sight)

300 Blackout AR 15 Rifle Kit (16″ Nitride Barrel & Fixed Front Site) w/ 80% Lower - Blog Photo #1

Classic M4 design

This particular 300 Blackout Rifle Kit has quickly become our top seller thanks to its classic M4A2 design: It sports a mil-spec M4 flattop upper receiver that’s forged from 7075 T6 aluminum. Just how the U.S. Military likes it. You’ll enjoy a classic A2 flash hider and A2 front sight post (co-witnesses perfectly with our bomb-proof Tactical Made Red Dot!).

Considering 300 Blackout was originally developed for Special Operations, it only makes sense to follow the same aesthetic.

Mil-spec nitride finish

On the business end, you’re getting a beautifully-rifled 16” barrel, complete with a nitride finish. Nitride sports a much darker and blacker color than an anodized rifle so if you want a stealthy shooter, you’re covered.

Carbine gas for super and subsonic

300 Blackout is a tricky round because to use it at its full potential, you need the right setup. Switching from supersonic to subsonic rounds requires having the right gas system.

We threw on a proper carbine-length system (and carbine buffer) so this upper can reliably handle both loads, suppressed or unpressed. Just un-screw the A2 flashhider and install your favorite suppressor!

Includes Forged Black 80% Lower + Parts Kit

80% Lower Fire/Safe Marked (1-pack) - Blog Photo #2Classic Lower Parts Kit | AR-15 - Blog Photo #3

We made things easy by throwing in the required 80% lower and Lower Parts Kit! 300 Blackout is so loved because it’s compatible with standard AR-15 parts, making your build easy and guess-free. Just grab an 80 Lower Jig (our customers love the Easy Jig GEN 2 for these lowers), finish it, slap in the Parts Kit, and throw on your upper. Your entire build can be done in a day!

300 Blackout AR 15 Rifle Kit Specs:

  • Barrel Profile: M4
  • Barrel Steel: Chrome moly vanadium
  • Barrel Finish: Black nitride
  • Chrome Lining: No
  • Muzzle Thread: 1/2×28
  • Chamber: .300 AAC Blackout
  • Twist Rate: 1:7
  • Barrel Extension: M4
  • Gas System: Carbine-length
  • Gas Block Size: .750″
  • Gas Block Type: Low-profile
  • Muzzle Device: A2 Flash hider
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Handguard Type: CAR-style fixed
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: 9310 steel, magnetic particle inspected
  • Bolt Carrier Profile: Full-auto
  • Charging Handle Included: Yes
  • Overall Length: 24.5″

NO FFL required to buy, ship, or build

The thing customers love most about our rifle kits and 80% lowers is that they do not require an FFL to buy, ship, build, or own! The ATF has long held that it is 100% legal to build a gun at home with no paperwork or background check required (as long as it’s for personal use and not for sale).  They don’t consider anything in this kit to be a firearm until you machine that lower. It’s time to build.

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80 Lowers, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.


Sign-up for exclusive discounts, new product releases and updates from

100% Satisfaction

Customer Service is our passion and we are here to answer any questions you have.

Shop With PRIDE

Shop With Confidence

Secure Payment

Left Menu IconMENU
Right Menu Icon