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300 Blackout Rifle Kit


300 Blackout Freedom Build Kit with AR15 Fire/Safe 80% Lower

300 Blackout - Classic Handguard with Fire/Safe Engraved 80% Lower

Limited time offer. Save 12% OFF now!

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Regular price $650.00 $550.00


AR-15 Build Kit - 300 Blackout (Keymod Handguard & 16" Barrel) with Fire/Safe Engraved  80% Lower Receiver

AR-15 Build Kit - 300 Blackout (Keymod Handguard & 16" Barrel) with Fire/Safe Engraved 80% Lower Receiver

Limited time offer. Save 12% OFF now!

Use coupon code:StartMyBuildFor 12% OFFClick to Copy

Regular price $799.95 $699.95


Budget Builders Ultimate 300 Blackout AR15 Rifle Kit

Budget Builders Ultimate 300 Blackout AR15 Rifle Kit

Limited time offer. Save 12% OFF now!

Use coupon code:StartMyBuildFor 12% OFFClick to Copy

Regular price $1,399.95 $999.95

300 Blackout Rifle Kit


Our 300 Blackout Rifle Kits offer you the easiest, most affordable, legal and simple way to build your own 300 Blackout-chambered AR 15 with no guesswork! Each Rifle Kit features quality, mil-spec steel, alloys and construction, and every Upper included with each Kit is pre-built to guarantee reliability and accuracy. Our 300 Blackout Rifle Kits all reliably and accurately shoot super and subsonic 300 Blackout loads, allowing your finished rifle to take full advantage of everything the whisper cartridge has to offer.

With so many 300 Blackout Rifle Kits out there, why ours? To start, our barrels are simply the best on the market. Each barrel is built from 4150 Chromoly or 416R Stainless, the best barrel steel available. All rifling is CNC cut to ISO 9002 quality control standards, guaranteeing 1 MOA accuracy. In fact, our regular production has shown 0.7 MOA accuracy, fresh off the line. To achieve this we heat-treat every barrel to achieve a hardness rating of RC 28 to 32, negating the need for chrome lining while creating the most rugged and wear-resistant rifling possible.

Lastly, every barrel is mated with a fully-built, mil-spec 7075 T6 receiver that houses a mil-spec charging handle and bolt carrier group. Our lower parts kits and buttstock assemblies included with every 300 Blackout Rifle Kit are no different – you’re getting the highest quality components for an easy build and a reliable, accurate rifle. The best part? It all ships straight to your front door, no FFL transfer fees, no paperwork, and no waiting around for a PICS check. All you need is a stripped lower!

Buyer's Guides for Additional Product Information:

Read: 300 Blackout Barrels Buyer's Guide

Read: 300 Blackout Barrel Steel Analysis

Read: 300 Blackout Upper Buyer's Guide

Benefits of Our 300 Blackout Rifle Kits:

  • Ships straight to your door, no FFL required!
  • Pre-built uppers are ready to fire out of the box
  • Includes every part to build a 300 Blackout Rifle
  • 4150 Chromoly and 416R SS barrels for accuracy
  • Features mil-spec receiver and barrel
  • Features mil-spec BCG and charging handle
  • Includes Picatinny, M-Lok, or Keymod handguard
  • Can be mated with any standard AR lower
  • Made & constructed in the USA