Return to 8.5" 300 BLACKOUT BARRELED UPPER - YANKEE HILL 9.675" DIAMOND
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5 of 5 300 Blackout upper October 30, 2016
: Ed R  
Purchase and shipping times were outstanding, received upper in 4 ds of purchase. Could not be happier with the upper, fit and finish were as advertised. Would recommend this product to anyone wanting to build a quality pistol.

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5 of 5 8.5" 300 BLACKOUT UPPER - YHM 9.675" DIAMOND September 12, 2016
: Travis C  
I looked around the world wide web for a long time for the perfect "complete 300 blackout pistol upper" and I can confidently conclude that the guys at MAS Defense are offering the best products on the market tod. Not only do they have stock of the items they sell, they do customized orders too. That is huge considering the current political climate. You can't find companies that offer this type of customer service and product availability on a consistent basis. Everybody else on the web is out of stock or on backorder and they don't tell you that until you are ready to pay them. On top of that, they are offering configurations that are out of date and they're not up on the latest and greatest.....NOT COOL!!!!You guys at MAS Defense are doing it the right way, keep doing what you're doing and I will keep coming back!!!

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5 of 5 8.5" 300 BLACKOUT UPPER - YHM 9.675" DIAMOND September 6, 2016
: Travis C  
Could not be happier with this upper! Fit and finish is flawless. Stainless steel barrel is top quality!I have already recommended MAS Defense to friends and will be a repeat customer.Awesome job guys!Shipping was super fast, placed the order on a Sund and the package arrived on Wednesd.You can't go wrong with products from this company. Beyond satisfied!

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5 of 5 AWESOME UPPER May 7, 2016
: Michael M  
Just as advertised, fits great, works even better. Customer service was friendly and knowledgeable and fast turn around from order to shipping. Strongly recommend this product. Best BAG (pun is intended) for your buck!

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5 of 5 ar pistol upper November 17, 2014
: Guzman L  
Fair price, great quality. Overall 5 star experience. Order the upper, Frid afternoon and the following Frid I received it.I definitely happy with the product and will keep doing business with Mas Defense.G. From Maryland

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5 of 5 300. blackout yhm diamond August 17, 2014
: Seedien S  
Did not try the uupper yet but MAS is very fast on shipping and I can vouch for there product becsuse I also have a 7.5 upper kit from them and its flawless it shoots the way it looks nice. A+++ I will definitely be buying from them again

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5 of 5 300 Blackout Upper December 23, 2013
: James H  
Very prompt shipping and a nice looking barrel. I'm in process of a build and haven't had an opportunity to try it out but it looks more than capable. Thanks guys. JimGreenville, SC

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