HOME > AR-15 > AR-15 BARRELED UPPERS > 300 BLACKOUT >

8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL
8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL


 
RETAIL: $383.00
Our Price: $331.99

Price with Selected Options: $331.99

Stock Status: In Stock

Product Code: MAS-083B1-MDNM-07

Upper Receiver Options:


Barrel Options:


Handguard Options:


Gas Block Options:


Gas Tube Options:


Muzzle Device Options:



Qty:  
DESCRIPTION
 
The options listed below come standard with this barreled upper. The drop down options listed above allow you to customize your build. You can leave them as is, change one option or change them all! We let you build your upper the way you want it built!

1. Upper Receiver - 7075 T6 Aluminum A4. Precision Machined to Mil-Spec Tolerances. Black Hardcoat Anodized Mil-Std-171 Type III. M4 Ramps, Forward Assist, Ejection Door.

2. Barrel - 8.5" - 9.5" 300 Blackout Barrel. Click on the drop down box above to choose from our selection.

3. Handguard - MAS Defense "NERO" 7.25" Slimline M-LOK Free Floating Handguard - (ID 1.25")

4. Gas Block - .750 Low Profile Steel Melonite Nitride Treated Gas Block

5. Gas Tube - Pistol Length Stainless Steel Gas Tube

6. Muzzle Device - A2 Half Cage

Bolt Carrier Groups and Charging Handles are sold separately.

All barreled uppers are head spaced and test fired to ensure function.

ALL LAWS APPLY. IT IS THE RESPONSIBILITY OF THE BUYER TO UNDERSTAND ALL LAWS REGARDING PURCHASE AND OWNERSHIP OF THIS UPPER. WE STRONGLY URGE YOU TO CONTACT YOUR LOCAL FFL AND/OR THE ATF WITH ANY AND ALL QUESTIONS TO MAKE SURE YOU UNDERSTAND THE LAW BEFORE PURCHASING THIS ITEM.

RELATED ITEMS
FORGED CHARGING HANDLE AR-15 - DUAL PULL AMBIDEXTROUS GEN 3 FORGED CHARGING HANDLE AR-15 - DUAL PULL AMBIDEXTROUS GEN 2 M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - MELONITE NITRIDE M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - ION GOLD TITANIUM NITRIDE (TiN)
Our Price: $24.99
Our Price: $24.99
Our Price: $139.99
Our Price: $164.99
FORGED CHARGING HANDLE AR-15 - DUAL PULL AMBIDEXTROUS GEN 3 FORGED CHARGING HANDLE AR-15 - DUAL PULL AMBIDEXTROUS GEN 2 M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT MELONITE NITRIDE BCG M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - ION GOLD TITANIUM NITRIDE (TiN)
FORGED CHARGING HANDLE AR-15 - STANDARD TACTICAL LATCH M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - NICKEL BORON
Our Price: $24.99
Our Price: $164.99
FORGED CHARGING HANDLE AR-15 - STANDARD TACTICAL LATCH M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - NICKEL BORON

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 12 CLICK HERE TO WRITE A REVIEW »

  0 of 0 people found the following review helpful:
 
5 of 5 Great upper March 26, 2021
: Grant Jones from Dunn, NC United States  
Great products each and every time I order from them.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
4 of 5 Great Fit/Perfect Size September 15, 2020
: from Plano, TX United States  
The only reason I do not give this a five star review is the barrel nut had to be adjusted a bit, but otherwise works perfectly!
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAS Defense Response: Sir, the Nero barrel nut does not need to be timed for the gas tube. It is torqued to 40+ FT LBs. We are not exactly sure what you mean by "adjusted". Please let us know.
Thank You for your feedback and your business!

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 Fantastic September 13, 2020
: Joshua Abernathy from Toney, AL United States  
The finish looks great. Seriously, great. Not one blemish. The finish matches my Springfield Saint Victor perfectly. There's no visual difference at all. It even has a tighter fit than the original upper. There's absolutely no play between the receiver's what so ever. The only small, and I mean small, thing that doesn't match flawlessly is the upper is about 1mm (maybe less) too wide on the ejection side. The other side is prefect. That's the only thing cosmetically that I can find that isn't a 100% perfect match, and even that isn't anything to complain about. I haven't got to shoot it yet, but I plan on doing that tomorrow to sight in my optic. I have no worries that the ballistic advantage barrel will be great. If anything funky happens I'll either edit this review or make a new one. But I feel like this thing is going to shoot as good as it looks. This is definitely the best option in this price range, and it's giving the more expensive companies a run for their money.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 superb upper April 13, 2020
: David Holder from longview, TX United States  
300 BLK functions flawlessly w/ spikes lower. Superior fit and finish, great job!

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 Another positive experience with Mas Defense March 4, 2020
: Yannic Lariviere from Freedom Loving Dinwiddie, VA United States  
This is my second 300 bo upper from M.D. and I am once again please with the quality of the parts and the workmanship of the builder. The BA barrel is far superior to the run of the mill barrels. These handguards are a great value and they look incredible. Keep up the good work yall. I am confident in your products, come tyrant or deer, they will go bang and put that round where I want it.

Was this review helpful to you?

View All Customer Reviews