Return to 16" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 15" M-LOK RAIL
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5 of 5 Great company to deal with September 11, 2023
: Tyler Randolph from White Rock, NM United States  
Ordered the upper and had a quick response on a part they didn’t have and they explained some things I did not know about the 300 blackout pistol and carbine gas systems and got it shipped out fast. Upper came packaged nice and secure and all parts are very nice quality. I will buy from MAS defense again for sure! Very impressed

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5 of 5 300 black out November 4, 2022
: Craig Hill from Kunkeltown, PA United States  
Perfect! In every way! Love it! Came to me ready to go!

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5 of 5 Better than expected September 17, 2022
: Gabe Belsha from Sedalia , MO United States  
Quality of upper far surpassed my expectations.  The finishing touches and appearance are great.  Mounts to my Aero lower perfect.

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5 of 5 Z November 14, 2021
: Leo Garcia from Grovetown, GA United States  


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5 of 5 Just what I expected, fast delivery. I ⁹ordered May 21, 2021
: RICH TOBIAN from Enumclaw, WA United States  


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5 of 5 May 31, 2020
: Andrew Hodges from Macclenny, FL United States  
Awesome people and got my order fast! Going to keep using MAS in the future.

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5 of 5 October 7, 2019
: Michael Weber from Springville, AL United States  
Great upper as always from Mas Defense. Love your stuff!!

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5 of 5 Excellent quality and customer service May 18, 2019
: Mike McNeil from Manteca, CA United States  
Received my upper today and it looks fantastic.  Haven't shot it yet, but the quality looks to be nothing short of excellent.  Zach @ MAS Defense was  extremely helpful, answered all of my questions and provided A+++ customer service. I will definitely be buying from MAS Defense again.

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