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.
AR 15 RIFLE KIT SPECS:
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".
AR-15Lowerreceivers.com 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.