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6" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL
6" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL


 
MSRP: $437.00
Our Price: $374.99
SALE PRICE: $289.99

Price with Selected Options: $289.99

Stock Status: In Stock


Product Code: MAS-063B1-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
 
6" 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 - 6" 300 AAC Blackout 1x8 4150 CrMoV Melonite Nitride Treated Steel

3. Handguard - 7.5" Mas Defense "RIDGELINE" M-Lok Free Float

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 can be added at a discounted price by selecting the applicable drop down box above. 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 - 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: 8 CLICK HERE TO WRITE A REVIEW »

  0 of 0 people found the following review helpful:
 
5 of 5 Exceeded my expectations November 4, 2023
: Steven J Martinez from Cheyenne, WY United States  
I already have their 16-inch 300 blackout upper, and I decided to get a 6-inch just for the heck of it, and man, was I surprised how well this thing performed. Much more accurate than I expected a 6-inch barreled upper to be. The quick shipping was nice, and the price is always great with this company, especially for the quality of fit and finish for their products.

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  0 of 0 people found the following review helpful:
 
4 of 5 Really nice build May 6, 2022
: Joe from , IL United States  
Hand guard is what sells this great contour for your hand to have a natural shelf. Really makes for a solid tub or tob grip.

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  0 of 0 people found the following review helpful:
 
5 of 5 Top notch quality! April 30, 2022
: Roger Workman from Mint hill , NC United States  
Could not be more satisfied with their craftsmanship and their attention to detail!

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  0 of 0 people found the following review helpful:
 
5 of 5 Lets Go Brandon November 11, 2021
: Justin Jones from McDonough, GA United States  
Once again another amazing product from these guys at an even better price. Quality is top notch and functionality is always 100%

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  1 of 1 people found the following review helpful:
 
5 of 5 Quality&affordable May 17, 2021
: Jacob from Midlothian, VA United States  
Got the bcg and charging handle to go with it. Looks really slick. Came in perfect no blems. Everything torqued to spec. Gonna be interested to see if itll run some 220 grain subsonic without messing with my buffer. Running standard h2 right now. Just going to be checking reliability for heavier loads because i do want to shoot subs suppressed and unsuppressed. If you are tired of psa and the normal companies. Definitely ORDER FROM HERE!!!!!!!! Update 5/16/21 doesnt cycle subsonic. Anything over 160 grain is a no go.
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MAS Defense Reply: Jacob, I would try using a standard 3oz carbine buffer or a custom lighter weight one. That should work when firing suppressed. If it does not, you may have to open the gas port in the barrel little by little. The problem is 300 BLK needs 9" of barrel length to complete the entire burn. Reducing the barrel by 1/3 creates less back pressure which is used to move the BCG and buffer. A larger gas port will allow more gas to flow through the gas system to move the components. If you switch to firing supers again you can swap the buffer to a H1 or H2 to absorb the additional back pressure.
Thank you for your business and your feedback!

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