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8.3" 9MM AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL
8" 9MM AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL
 
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MSRP: $355.00
Our Price: $267.99
SALE PRICE: $242.99

Price with Selected Options: $242.99

Stock Status: In Stock


Product Code: MAS-089M0-MDRL-10

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:



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DESCRIPTION
 
8.3" 9MM AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" 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 - 8.3" 9MM NATO (9x19) 1x10 4150 CrMoV Melonite Nitride Treated Steel

3. Handguard - MAS Defense "RIDGELINE" 9.87" Slimline M-LOK Free Floating Handguard - (ID 1.25")

4. Muzzle Device - Slim Flash Can

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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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 Perfect Thursday, September 24, 2026
: Ryan Fees from Pottsville, PA United States  
I was gonna build a 9mm upper part from part until I decided to get this one. And im glad I did. I used the drop down and chose exactly what I wanted and its perfect.

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  0 of 0 people found the following review helpful:
 
5 of 5 Friday, September 4, 2026
: Terry Boushie from Ironton, MO United States  
Fast shipping, great prices, awesome uppers.

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  0 of 0 people found the following review helpful:
 
5 of 5 Eye catching Friday, March 15, 2024
: Brett T from Saint Louis, MO United States  
When I first saw this I knew this was the upper for my pcc build! Upon receipt itโ€™s exactly what I hoped it would be. Great build quality, not too heavy, not too light and balanced.

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  0 of 0 people found the following review helpful:
 
4 of 5 Poor shipping Saturday, March 2, 2024
: Ben Mixon from Lyons, GA United States  
I would like to review your product but I haven't received it yet. The website is well laid out. The ordering process is easy but the shipping needs a different carrier.  I placed my order on the 20th with priority shipping and it still hasn't arrived.  My previous order was the same way

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  0 of 0 people found the following review helpful:
 
5 of 5 great upper and fast shipping Monday, August 29, 2022
: Dan from CT United States  
The handguard has a great look yet much lighter than usual quad rails on the market and the FDE color adds the look I was going after , no complaints !

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