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8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL
8.5" 300 BLACKOUT BARRELED UPPER - MAS RIDGELINE 7.25" M-LOK RAIL
 
MSRP: $398.00
Our Price: $335.99
SALE PRICE: $285.99

Price with Selected Options: $285.99

Stock Status: In Stock


Product Code: MAS-083B1-MDRL-07

Upper Receiver Options:


Barrel Options:


Handguard Options:


Gas Block Options:


Gas Tube Options:


Muzzle Device Options:


***ON SALE - Choose a Bolt Carrier Group:


***ON SALE - Choose a Charging Handle:



Qty:  
DESCRIPTION
 
8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL

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 "RIDGELINE" 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.

***80% LOWERS CANNOT BE PURCHASED WITH BARRELED UPPERS OR BUILD KITS. ORDERS THAT INCLUDE THEM WILL BE CANCELLED AND CHARGED A 15% CANCELLATION FEE***.

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M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - HYBRID NICKEL BORON M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - MELONITE NITRIDE FORGED CHARGING HANDLE AR-15 - STANDARD TACTICAL LATCH M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - HYBRID GOLD TITANIUM NITRIDE (TiN)
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M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - NICKEL BORON AR-15 M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT MELONITE NITRIDE BCG FORGED CHARGING HANDLE AR-15 - STANDARD TACTICAL LATCH M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - HYBRID GOLD TITANIUM NITRIDE (TiN)

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 6 CLICK HERE TO WRITE A REVIEW »

  0 of 0 people found the following review helpful:
 
5 of 5 Awesome March 2, 2023
: John Turgeon from Corinna, ME United States  
Love the looks of this upper! Great quality control and no complaints what so ever! Certainly be a returning customer!

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  0 of 0 people found the following review helpful:
 
5 of 5 Nice Little Unit January 17, 2022
: Adam O from Western Colorado  
This is a nice little unit.  It is my first upper from MAS and I have zero complaints.  The fit and finish is good and I have had zero issues with the performance of the upper when shooting.  The FDE color is right in line with the standard Magpul FDE, so matching aftermarket components has been perfect.  

I am running 220 grain subs out of mine and still fine tuning my load development, but initial results show perfect accuracy.

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  0 of 0 people found the following review helpful:
 
5 of 5 Happy with purchase December 6, 2021
: Curious George the 3rd from Slaughter, LA United States  
I came across mas defense by Google searching uppers and parts with good reviews . The finish and fit are very good, no issues cycling heavy subs and light supers , and it was shipped in a box that was very well packed . I haven't ran that many rounds through it yet but it has given me accuracy that I'm pleased with.
For the negative points which aren't anything that would stop me from getting another , are the handguard is a tad heavy/bulky...esp near the receiver on left and right side...if those qd mounts were eliminated it would be a little slicker. And when installed flush with the upper receiver , it wouldn't allow the lower pins to engage ...had to loosen it and slide it forward Just a few thousandths of an inch.
 . Ive bought a lot of other brands over the years and I'm impressed by these for the price ..

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  0 of 0 people found the following review helpful:
 
5 of 5 May 17, 2021
: from laughlin, NV United States  


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  0 of 0 people found the following review helpful:
 
5 of 5 Excellent Quality April 26, 2021
: MJ from Colorado  
Really happy with my .300 blk complete upper purchase from Mas. The handguard is unique and really cool. The barrel, gas block, and muzzle device options are great. Fantastic value for the price. Mas Defense is GTG.

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