Return to 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 12.62" M-LOK RAIL

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Review December 11, 2022 : Ramon Solis from Clovis, NM United States   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! Was this review helpful to you?

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Overall good product September 1, 2022 : 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. Was this review helpful to you?

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Beautiful upper receiver December 25, 2021 : 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! Was this review helpful to you?

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Awesome 300 blackout upper September 14, 2021 : 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. Was this review helpful to you?

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Excellent September 7, 2021 : 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. Was this review helpful to you?

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worth the wait! June 2, 2021 : m. vasquez from , sf NM   Many products have been unavailable for months so when I saw this in stock I hopped on it. MAS defense is high quality with precision components and craftsmanship! Everything is fit perfectly and shipped fast. Get it while you can! Was this review helpful to you?

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Awesome June 17, 2020 : Brian Dilley from Cameron, NC United States   It was awesome arrived on time. Installed the upper and fires like a champ. Was this review helpful to you?

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Super easy, super service June 15, 2020 : Da Chief from Cayucos, CA United States   Great quality and comfortable grip. All of masdefense’s parts have exceeded my expectations. Their service is top-notch Was this review helpful to you?

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Amazing April 29, 2020 : Steven Morris from SARATOGA SPRINGS, NY United States   I'm more than pleased. Everything is assembled perfectly, the lines are clean, and it is the perfect look for my 300 pistol. Was this review helpful to you?