Return to 10.5" 5.56 / .223 BARRELED UPPER - YANKEE HILL 9.675" DIAMOND
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5 of 5 Fast great service June 1, 2014
: Chris S  
Just received my 10.5 spikes tactical with YHM diamond upper. Only took a week to receive it and it came in just as ordered. Great product and am excited to complete my new pistol build. Look forwardto doing more business with your company

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5 of 5 Must have! May 13, 2014
: Michael V  
I ordered this upper and received it quick! It is a solid. The upper was put together well and is great quality. The price is outstanding for the quality of work and type of equipment purchased. I will definitely buy again from MAS!Mike

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5 of 5 Zman1017 April 22, 2014
: jim z  
I bought this upper chambered in 300 Blackout back in October from Mas and was very pleased. Decided to build another pistol so I went with this one chambered in 556 and once again very nice unit. Very happy with the customer service I recieved and fast shipping too. Thanks Mas.....

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5 of 5 Yhm 10.5 upper April 21, 2014
: richard g  
Upper arrived in less than 1 week. I was very pleased with it, they packaged it nicely. Cant wait to shoot it !!!

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5 of 5 Awesome March 30, 2014
: Raymond G  
Picked one of these uppers up for an AR pistol build and couldn't be happier; I received my upper quickly and it is flawless, exactly what I wanted! Thanks again; Ray

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5 of 5 10.5" Yankee hill 5.56 upper March 16, 2014
: David G  
Out freaking standing . This upper is absolutely the best product at a great price. Zero flaws, operates flawlessly

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5 of 5 Quality product from a fine manufacturer. September 4, 2013
: Elmer R  
I ordered two of these. One for myself and the other one for my brother. We were having a tough time finding AR pistol uppers and I found this company on Gunbroker. My order turn around time was oneweek and the quality of the build was phenomenal. Good turn around time and attention to details. I will recommend this place to my buddies.

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5 of 5 Quality September 2, 2013
: Steven M  
Quality. One word says everything. I'm completely satisfied... ThanksSteven

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5 of 5 Thanks to MD August 19, 2013
: Joseph T  
I purchased this upper for a pistol build. Initially, I called because I had never heard of the company before. Mario was beyond helpful; he was responsive to my inquiries, had good answers to my questions, and got me the build I wanted in just a few ds. I took the build to the range on 8.16.13. Initially I had some FTE issues, but I was running an old BCG, once I switched that out I was ringing steel at 50 yards with no problems- over 80 rounds moderate to rapid fire flawlessly. I look forward to buying from Mas Defense for future builds.

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5 of 5 PURCHASE NOW!! August 18, 2013
: Michael F  
I was a U.S. Marine Infantryman for 22 years retired. The last five years I was the chief Instructor for Infantry Training Battalion and responsible for training have the U.S.M.C infantry in this recent war. Now I am a Law Enforcement Officer. I was looking to purchase an item for my weapon and called the owner. He informed me about the products he had and how they were made (all this time after hours). I ordered the 10.5" .223/5.56 YHM Diamond Upper from MAS Defense and I was impressed with their turn around time. Within a couple of ds of ordering online they sent me a shipment tracking notification. A few ds later, my new upper arrived and it was exactly as described. I received in a box with paper and bubble wrap, which the product and no damage to it. Take from a Military and Law Enforcement Weapons expert. I would recommend MAS Defense to anyone looking purchase a superior quality product for there weapon at a great price and personal attention from the owner!

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