Real time inventory. No backorders. Ships within 1 - 3 Business Days!

.300 Blackout AR-15 Pistol Kit - 8.5” Barrel, 1:8 Twist Rate with 9” Lightweight MLOK Handguard

Was: $799.99
Now: $649.99
SKU:
5165449733_5165448884
Availability:
In Stock! Ships within 1 - 3 Business Days!
  • Fast Shipping

  • Thousands of Reviews

  • 7 Day Customer Service

  • Amazing Selection

Wanna squeeze more performance out of your .300 AAC blackout AR when it comes to subsonic rounds?  If you plan to get a suppressor, then you need this AR build kit chambered in .300 BLK! Its shorter barrel when paired with a suppressor makes an excellent means of slingin’ lead downrange. This build kit starts with an upper assembly made of an 8.5 inch barrel with a 9 inch lightweight M-Lok handguard.  You also get a lower parts kit that comes with a polished trigger for a little smoother performance, a Magpul MOE grip, and the SBA3 adjustable pistol brace by SB Tactical. 

What’s Included

This kit is not a firearm. It includes an assembled upper receiver, bolt carrier group, lower parts kit, and buffer assembly with pistol brace. 

Here's the beginner's guide to 80% lowers.

300 BLK Pistol Kit Specs

Barreled uppers are assembled in-house before shipment.

Barrel

  • Chamber: .300 AAC Blackout
  • Contour: Heavy
  • Length: 8.5"
  • Twist Rate: 1:8
  • Gas System: Pistol
  • Muzzle Threads: 5/8x24
  • Feed Ramps: .30-Cal
  • Material: 4150 CMV
  • Finish: Parkerized
  • Process: Button Rifled
  • Lining: None
  • Extension: M4
  • Muzzle: Fluted Flash Can

Handguard

  • Attachment System: 9" M-Lok
  • Finish: Type III Hardcoat Anodized (Mil-Spec)
  • Top Rail: M1913 Picatinny
  • Material: Billet 6061-T6 Aluminum
  • Attachment: Barrel Nut 

Upper Receiver

  • Profile: M4 Flattop
  • Material: Forged 7075-T6 Aluminum
  • Finish: Type III Hardcoat Anodized (Mil-Spec)

Bolt Carrier Group

  • Profile: M16/Full-Auto
  • Steel: Carpenter No. 158 (Mil-Spec)
  • Exterior: Phosphate Coating
  • Interior: Chrome-Lined
  • Gas Key: Staked, Chromed
  • Charging Handle: Included

Lower Receiver Parts

  • Buffer System: Mil-spec, Carbine
  • Pistol Brace: SB Tactical SBA3
  • Parts Kit: Mil-spec, single-stage

Lower receiver sold separately. 

WARNING: Handling firearms parts and certain firearm accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov 

Shipping Restrictions 

We cannot ship certain parts and accessories to states that prohibit the sale or ownership of such components, like California, New York, and others. Before ordering, see our shipping restrictions for a list of all prohibited states and locales. We try our best to keep our shipping restrictions current, but state laws change almost daily. It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. 

80-Lower.com only ships within the United States. Federal law prevents international shipments of our products. 

WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov

Shipping Restrictions

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 or "assault weapons" (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 or machining a firearm. We try our best to keep our shipping page current, but laws change daily.

80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

Caliber:
.300 AAC Blackout
Barrel Size:
8.5"
Twist rate:
1/8
Barrel Finish:
Parkerized
Handguard Type:
Free-float
Gas System Length:
Pistol-length

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, Hawaii, 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.