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18" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 15" M-LOK RAIL
18" .556 BARRELED UPPER - MAS RIDGELINE RIDGELINE 15" M-LOK RAIL
 
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MSRP: $445.00
Our Price: $344.99
SALE PRICE: $299.99

Price with Selected Options: $299.99

Stock Status: In Stock


Product Code: MAS-185N4-MDRL-15

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
 
18" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 15" 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 - 18" 5.56 / .223 Barrel. Click on the drop down box above to choose from our selection.

3. Handguard - MAS Defense "RIDGELINE" 15" Slimline M-LOK Free Floating Handguard - (ID 1.36")

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

5. Gas Tube - Rifle 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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Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 1 CLICK HERE TO WRITE A REVIEW »

  0 of 0 people found the following review helpful:
 
5 of 5 Turned out beautiful in FDE September 18, 2025
: ACfromNC from Waynesville, NC United States  
I purchased this and the bout their lower in FDE with their logo on it and it turned out awesome. The cnc quality, cerakote paint (matches Magpul) and quality in steels and aluminum is all on point. The quality of their uppers is just as nice as a DD or Geissele upper when comparing the quality of steel and aluminums used for a fraction of the price. I mean, just look at their 4.9/5 star Google reviews on over 1200 reviews. That's an incredible Google rating. Their customer service is great, ridiculously fast shipping and these guys take pride in what they do.

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