Return to 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL

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Going great so far! November 26, 2023 : Cody Stevens from Goldthwaite, TX United States   Shipping was supper quick! Upper was just as it was portrayed in the description and picture. Took it to the range and ran a few mags through it without issue. Would recommend! Was this review helpful to you?

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February 12, 2023 : Kelly Crowder from Folsom, LA United States   Was this review helpful to you?

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Awesome Upper December 10, 2022 : Dean from Odessa, FL United States   Awesome Upper, great quality and value.  I wish they would offer the 300 in a 12.5" barrel. Was this review helpful to you?

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3rd purchase now August 10, 2021 : Steven Soltysiak from Foristell, MO United States   I’ve just received my 3rd purchase from you guys in the last 2 months, and could not be happier. Not only with the pricing and quick shipping, but the selection sets you guys apart. Not only can I select the size and  hand guard design, but Also the manufacturer of the exact barrel you will mount on it for me?? Absolutely great guys. With this being said guys, don’t go raising ur prices. This is what sets you apart and has me showing my friends and coworkers. Keep up the good work. Thanks again Was this review helpful to you?

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February 4, 2021 : Mike from Hurricane, UT United States   I would highly recommend buying from This company Quality product w fast shipping Was this review helpful to you?

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Surprised by quality April 15, 2020 : Del from WAKE FOREST, NC United States   This was my first purchase from MAS Defense. I was pleasantly surprised when this upper arrived. The product exceeded my expectations. I complemented my Warthog .300BO build nicely (as expected). While other uppers are available cheaper, you get what you pay for. I intend to purchase again from MAS Defense for my next build. I'll probably do the same for some existing builds. Was this review helpful to you?

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these uppers are fantastic March 30, 2020 : Levi Pettey from ROCHESTER, MN United States   I love the quality of the ballistic advantage barrel, and the ridgeline forend is by far my favorite Was this review helpful to you?