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10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 12" LIGHTWEIGHT QUAD RAIL
10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 12" LIGHTWEIGHT QUAD RAIL
 
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MSRP: $423.00
Our Price: $348.99
SALE PRICE: $298.99

Price with Selected Options: $298.99

Stock Status: In Stock


Product Code: MAS-103B1-MDSQ-12

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 12" 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 12" 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 - 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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FORGED CHARGING HANDLE AR-15 - STANDARD TACTICAL LATCH M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - HYBRID GOLD TITANIUM NITRIDE (TiN) M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - NICKEL BORON AR-15 M16 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT MELONITE NITRIDE BCG

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 9 CLICK HERE TO WRITE A REVIEW »

  0 of 0 people found the following review helpful:
 
5 of 5 Perfect December 28, 2023
: Chris Miller from Magnolia, TX United States  
If you are wanting an upper with a rail that looks menacing and will allow you to tuck a suppressor this is it. The crew at MAS has a killer shipping department probably the fastest I have ordered from. Thanks again for the quality products and service

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  0 of 0 people found the following review helpful:
 
5 of 5 10.5 300 blackout upper December 10, 2022
: Clayton Mayhew from Poteau, OK United States  
Honestly this is the best looking upper I’ve found! The quality was very surprising for the price point and the MAS Defense handguards have to be my favorite out of any I’ve ever owned. Everything was very tight and well built! I will buy all my uppers from here for now on! MAS Defense FTW!!!

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  0 of 0 people found the following review helpful:
 
5 of 5 It's solid October 5, 2022
: from King, NC United States  
After swapping for my QD brake, I proceeded to practically light the barrel on fire. I'm talking enough round count that when I was done, I was worried that I was going to melt stuff in my truck, or cook off rounds if it shifted into boxes of ammo. The kind of heat that you just know that any more will light your barrel up like a glow stick.

It kept running. Like a champ. No failures. Subs and supers. Hot as hell itself. And there was enough gas and brass fragments by the time I was done that cleaning my lower was like dumping out a lower thrown into Iraqi sand. But with my DLC bolt in it, this upper wasn't grinding. It was filthy, and should have felt like the bolt was covered in sandpaper, but even as my selector started sticking the upper kept going without even the slightest hint that anything had changed.

So yeah, I'm sold on Mas. When the non-cheese grater guard is in stock I'm buying it. And I'll probably be picking up more uppers as I need em.

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  0 of 0 people found the following review helpful:
 
5 of 5 10.5” 300 Blackout Upper July 22, 2020
: Michael Mirelez from San Antonio, TX United States  
Outstanding Upper it arrived just in Rome for weekend Pig hunt. Poor Pigs never knew what him them. Again outstanding product

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  0 of 0 people found the following review helpful:
 
5 of 5 Quality Service & Merchandise June 26, 2020
: Douglas Williams from Tyner, NC United States  
Once again, very satisfied with a purchase from MAS defense.  Fit, form and function - excellent!  Quick service and delivery.

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