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10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL
10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL
 
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MSRP: $398.00
Our Price: $337.99
SALE PRICE: $287.99

Price with Selected Options: $287.99

Stock Status: In Stock


Product Code: MAS-103B1-MDSQ-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
 
10.5" 300 Blackout Barreled Upper - MAS Squadron 9.87" Lightweight Quad 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 - 10.5" 300 Blackout Barrel. Click on the drop down box above to choose from our selection.

3. Handguard - MAS Defense Squadron 9.87" Lightweight Quad Rail - (ID 1.8")

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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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 5 300 blk complete upper Thursday, September 3, 2026
: Kevin Gaudet from Newbury Park, CA United States  
I have purchased 3 complete uppers from mas defense every one has operated and functioned perfect. I went with 300 black out.
This one took the cake for me I chose the Fde Upper with all the options including flash can, and the gold Bcg Absolutely beautiful .
Everything about it is done to perfection. If I could give 6 stars I would. Shipping was super fast customer service is really easy to deal with.
Highly recommend. Thank You again

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  0 of 0 people found the following review helpful:
 
5 of 5 Always A+++++ Thursday, February 4, 2021
: Chris Behm from Plainville, CT United States  
Amazing 300blk upper, but no one ever hit me up about possibly changing my A2 birdcage prior to shipping for a flash can!  I emailed you guys to no avail!

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  0 of 0 people found the following review helpful:
 
5 of 5 Bang bang Wednesday, July 29, 2020
: from MD United States  
Only put about 200 rounds through so far, but it does exactly what you want. Shoots straight (at least as far as my talent will let me), doesn't do anything funny, feels solid, and shipped very quickly.  Highly recommend.

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  0 of 0 people found the following review helpful:
 
5 of 5 10.5" blackout barrel Thursday, July 23, 2020
: charles Hamilton from mount jewett, PA United States  
great upper barrel package

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  0 of 0 people found the following review helpful:
 
5 of 5 Awesome Friday, July 10, 2020
: Kyle B from Berea, Ohio United States  
Haven't gotten the chance to shoot it yet, but it looks great. Overall quality seems excellent as usual.

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