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300-blackoutupper-com: 80% Lowers, Jigs, Build Kits & More! – 80 Lower Jig

Budget Builders Ultimate 300 Blackout AR15 Rifle Kit

$1,360.00 $950.00 (You Save $410.00)

Budget Builders Ultimate 300 Blackout AR15 Rifle Kit
Budget Builders Ultimate 300 Blackout AR15 Rifle Kit
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Free Shipping on all orders $325+!

SKU: BudgetUltimate_300BLK


Guaranteed to be the best present you have ever purchased for the beginner or experienced gunsmith in your life (or for yourself). The kit is engineered to bring you every single component needed to build your own rifle at home. Give it as a gift or keep it for yourself for the best all in one package you can find. Stop worrying if you have every part to start your build, purchase this kit and you’re good to go.


Gas System: Carbine-length
Barrel Profile: Government
Barrel Steel: Chrome moly vanadium
Barrel Finish: Parkerized
Chrome Lining: No
Muzzle Thread: 5/8×24
Chamber: .300BLK
Twist Rate: 1:8
Barrel Extension: .300BLK
Gas Block Size: .750″
Gas Block Type: A2 front sight
Muzzle Device: A2 flash hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: CAR-15 style fixed
Bolt Carrier Group Included: Yes
Bolt Steel: 9310 steel, magnetic particle inspected
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes

Benefits of the 16” Carbine-Length Parkerized AR 15 Rifle Kit:

  • 100% legal to own and ship to your front door
  • Not considered a firearm – no FFL paperwork needed!
  • Chrome moly vanadium steel barrel and parts kit ensure sub-MOA accuracy
  • Prebuilt upper with gas system removes the guesswork of rifle making
  • Includes bolt carrier group, free-floated M-Lok handguard and lower parts kit

The Ultimate Accessories

  • Magpul rear flip-up sight
  • Classic 6-position butt stock
  • Tactical rifle sling
  • Tactical rifle case with customizable foam inserts

The Tools to Get the Job Done:

  • Easy Jig Gen 2 AR15/AR9 (80% Lower Jig)
  • Easy Jig Gen 2 Tooling (drill & end mills bits)

AR 15 Rifle Kit Details (Expanded):

Barrel: 16″ carbine-length chrome moly vanadium steel, chambered in .300BLK, 1:8 twist rate, .750″ A2 front sight gas block, CAR-15 style fixed handguard, with an A2 “birdcage” flash hider.

Upper Receiver Assembly: Forged from 7075 T6 aluminum, hard-coat anodized in black for durability, features M4 feed ramps, and are made in the USA.

Bolt Carrier Group: The bolt carrier is made from 9310 steel and has a staked gas key and black nitride finish. The bolt itself comes complete with an extractor spring and O-ring insert.  It accepts .223, 5.56mm, and .300BLK calibers (though you should NEVER attempt to use a caliber for which your rifle is not chambered), and is magnetic particle inspected.

80% Lower Receiver: Choose to receive a forged or billet Fire/Safe 80% lower receiver.  Our lower receivers are anodized to match the upper receiver perfectly. and they come ready for machining of the trigger pocket and drilling of the safety selector and trigger pin holes.

AR-15 Lower Parts Kit: includes all parts needed to complete the lower receiver including pistol grip, mil-spec safety selector, and trigger/fire control group.

Lower Assembly: comes with complete buffer tube assembly including buffer, buffer spring, six-position buffer tube, latch plate, castle nut, and butt stock based on original Colt design.

Charging Handle: standard size, made from 6061 aluminum.

Please note: This build kit requires that the builder complete the 80% lower receiver themselves, but that’s the rewarding part of the experience (and the only way to build your own AR-15 without the need of an FFL transfer or serialization).

No FFL required Made in the USA Lifetime Warranty

Shipping Restrictions only ships within the United States. Federal legislation dictates we cannot ship our products internationally. Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website.
We try our best to keep our shipping page current, but laws change daily. 

Budget Builders Ultimate 300 Blackout AR15 Rifle Kit

$1,360.00 $950.00 (You Save $410.00)

Out of stock

$1,360.00 $900.00 (You Save $460 )
Save For Later
Save For Later

Free Shipping on all orders $325+!


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