Description
Please note: We strive to provide the most accurate photographs of our product. Due to availability limitations and supply chain constraints, slight variations of the handguard of this upper assembly may occur in the aesthetics of the skeletonizations in between the M-Lok sections.
If you’ve caught that certain spark, and now you’re looking to build your own AR-15 chambered in .300BLK (.300 AAC blackout), you might as well do it with some damned style. Check out this .300BLK built kit. The core of its attitude is a 16-inch stainless steel barrel that’s been coated in black nitride and given bear claw fluting for that extra in-your-face flair. Plus, it’s side-charging, so your new baby won’t be boring. It’s also got a 12″ free-floating M-Lok handguard on which to mount your light, laser, or whatever else.
Plus, we give you most of the extras you’ll need to complete the whole kit. You get a mil-spec buffer tube assembly and butt stock that adjusts in the standard six positions and of course a mil-spec lower parts kit. All you need to do is finish and add your own 80% lower either in 7075 forged aluminum or 6061 T6 billet aluminum. Then of course, top it off with the backup sights or optic of your choice. Please note, mags and ammo are not included.
Barrel
- Chamber: .300 AAC Blackout
- Contour: Heavy
- Length: 16”
- Twist Rate: 1:8
- Gas System: Carbine
- Gas Port: 0.750”
- Gas Hole Dia.: 0.070”
- Muzzle Threads: 5/8×24
- Feed Ramps: M4
- Material: 4150 CMV
- Finish: Stainless Steel and Black Nitride
- Process: Button Rifled
- Lining: None
- Extension: M4
- Muzzle: A2 “Birdcage” Flash Hider
Handguard
- Attachment System: 12″ 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: 9310 Tool, HPT/MPI-tested
- Exterior: Black Nitride
- Interior: Black Nitride
- Gas Key: Staked,
- Charging Handle: Included
Lower Receiver Parts
- Buffer System: Mil-spec, Carbine
- Buttstock: Mil-spec, M4-type
- Parts Kit: Mil-spec, single-stage
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 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.
- Barrel Size:
- 16″
- Caliber:
- .300 AAC Blackout
- Twist rate:
- 1/8
- Barrel Finish:
- Stainless Steel
- Handguard Type:
- Free-float
- Gas System Length:
- Carbine-length
- Barrel Size:
- 16″
- Caliber:
- .300 AAC Blackout
- Twist rate:
- 1/8
- Barrel Finish:
- Stainless Steel
- Handguard Type:
- Free-float
- Gas System Length:
- Carbine-length
Frequently Asked Questions
- How fast is shipping?
- Orders ship within 3 business days to your selected Michigan FFL dealer with full tracking info.
- Where can I pick up my firearm?
- Pickups are at licensed FFL dealers in Michigan. Use terms like “gun shop near me in Michigan” or “FFL dealer in Michigan” to locate one.
- Do I need a permit or license?
- For handguns, residents must obtain a License to Purchase (unless they already hold a CPL). Long guns from FFL dealers require no additional permits—per Michigan law.
- Can I carry this concealed or openly?
- Michigan is a “shall-issue” state for concealed carry at age 21+. Open carry is allowed without a permit, except in vehicles or specified locations :contentReference[oaicite:20]{index=20}.
- Is this .300 Blackout AR 15 Side-Charging Rifle Kit - 16" Stainless and Black Nitride Fluted Heavy Barrel, 1:8 Twist Rate with 12" M-Lok Handguard right for me?
- Our .300 Blackout AR 15 Side-Charging Rifle Kit - 16" Stainless and Black Nitride Fluted Heavy Barrel, 1:8 Twist Rate with 12" M-Lok Handguard is ideal if you’re shopping for: .300 Blackout AR 15 Side-Charging Rifle Kit - 16" Stainless and Black Nitride Fluted Heavy Barrel, 1:8 Twist Rate with 12" M-Lok Handguard, AR Build Kits. Great options for both beginners and experienced owners.
- Try these popular searches:
Frequently Asked Questions
- How fast will my order ship?
- We ship all orders within 1-3 business days to your licensed Michigan FFL dealer. Tracking info will be emailed.
- What is your return policy?
- Non-firearm items can be returned within 14 days unused. Firearms sales are final after FFL transfer. See full return policy.
- Is the .300 Blackout AR 15 Side-Charging Rifle Kit - 16" Stainless and Black Nitride Fluted Heavy Barrel, 1:8 Twist Rate with 12" M-Lok Handguard suitable for me?
- Our .300 Blackout AR 15 Side-Charging Rifle Kit - 16" Stainless and Black Nitride Fluted Heavy Barrel, 1:8 Twist Rate with 12" M-Lok Handguard is popular among Michigan customers for personal defense and sport shooting.
