AR15 Pistol Kit - .300 AAC Blackout (10.5" Stainless Barrel & 10" M-Lok Handguard) with Fire/Safe Marked 80% Lower



Check out one of the most accurate stainless uppers you'll find in .300 BLK! This AR-15 build kit sports a hyper-accurate 10.5" barrel made from 416R stainless steel. A 1:8 twist rate easily handles light and heavy loads for supersonic and subsonic shooting, while a free-float M-Lok handguard provides all the space you need for attachments, accessories, and your favorite optics and irons.

In addition to the pre-built upper receiver, you get to pick out an 80% lower. This build kit includes everything else you need to complete your pistol: A mil-spec lower parts kit,a Shockwave Blade pistol kit with buffer tube and buffer, and an M16 BCG and mil-spec charging handle. You can finish this build kit off by adding either a set of backup sights or an optic of your choice.


Gas System: Pistol-length

Barrel Profile: Heavy

Barrel Steel: 416R

Barrel Finish: Stainless steel

Chrome Lining: No

Muzzle Thread: 5/8 x 24

Chamber: .300 BLK

Twist Rate: 1:8

Barrel Extension: .300 AAC Blackout

Gas Block Size: .750″

Gas Block Type: Low-profile

Muzzle Device: A2 Flash hider

Receiver Material: Forged 7075 T6

Receiver Type: A4

Handguard Type: 10″ M-Lok

Bolt Carrier Group Included: Yes

Bolt Steel: 9310 steel, (MPI) magnetic particle inspected

Bolt Carrier Profile: Full-auto

Charging Handle Included: Yes

Benefits of the 10.5” Pistol-Length SS AR 15 Rifle Kit:

  • 100% legal to own and ship to your front door
  • Not considered a firearm – no FFL paperwork needed!
  • 416R stainless barrel and Freedom 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

AR 15 Rifle Kit Details (Expanded):

Barrel: 10.5″ pistol-length, 416R stainless steel, chambered in .300 BLK, 1:8 twist rate, .750″ low-profile gas block, 10″ free-float M-Lok 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, 5.56, and .300 BLK 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 Parts Kit: Includes complete, mil-spec AR-15 parts kit. Features MOE trigger guard and Enhanced Polished Trigger (EPT).

Charging handle: Standard 7075 Forged charging handle.

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).

It is your responsibility to fully understand all applicable laws and regulations regarding purchase and ownership of uppers with a barrel length of less than 16".

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.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.