Have not received item yet. ---------------------------------- MAS Defense Reply: Ramon, not sure why you would leave us a 1 star review. I'm guessing it's based on the slower than normal shipping of USPS but unfortunately, we have no control over them. You placed your order on 11/25. We shipped it on 12/2, 5 businesses days after you placed the order. Keep in mind, Black Friday and Cyber Monday just took place. Your order is set to be delivered in two days on 12/13. I hope you enjoy your upper once you receive it! Thank you for your business and your feedback!
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Overall good product
September 1, 2022
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Andrew Leverson from Combined Locks, WI United States
Everything looks and works great except the pic rail on the receiver has a taper machined into one side. On the right side the rail lines up perfect with the hand guard but on the left side the receiver has about an 1/8†step so they don’t line up.
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Beautiful upper receiver
December 25, 2021
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Brian Johnson from Knox City, TX United States
Was a tight fit on my sco-15 lower receiver but other than that great upper receiver, the customization is awesome, fast shipping , no complaints, very satisfied, will be buying again for my next builds ! Thanks Mas Defense!
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Awesome 300 blackout upper
September 14, 2021
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Terrence White from Indian Trail, NC United States
This upper is beautiful, very well built and packaged perfectly. Shipping was fast and I can't wait to finish this build. If this upper performs on the range as well as it looks, this will become one of my favorite range shooters and my go to home defense. Will definitely bepurchasing from mas defense for more builds.
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Excellent
September 7, 2021
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James R Carter from Francestown, NH United States
Could not be happier. Very first AR of any kind. All fasteners were tight. Rail alignment was perfect. Finish was very good. Receiver (slick side) fit perfect on Aero X-15 lower. Function was flawless with toolcraft BCG and using SMB carbine buffer. Threw cases to 4 o’clock consistently. Would and will buy from MAS again. I’m so glad I found your site.
Review 
Overall good product 
Beautiful upper receiver 
