Return to MAS DEFENSE AR-15 UPPER RECEIVER - XL (.450 .458 .50)

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Fantastic .450/.458 Upper Receiver September 13, 2023 : from East Stroudsburg, PA United States   This is a great .450/.458 upper. It is perfect spec and the MAS Defense XL stamp was a very nice touch. I look forward to completing this build with a 10.5" .458 Socom barrel. Was this review helpful to you?

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Seams good February 22, 2023 : Twigster from Newberg, OR United States   Fits in a aero lower with out too much movement. I’m not currently using it in a built at the moment so I just dry fitted all component except for a desk cover. The Faxon barrel i have laying around slides in easily with some movement. The same barrel had a more tight fit with the other upper I bought. I bought two ar15 uppers, this one with the extra milling clearance in the dust cover area so 450 & .458 cal cases can more efficiently eject & also has a forward assist, and a slick side.  I noticed that both receivers came from different forging houses and also have different ano finish textures. Which I find surprising if Mas is doing there own machining and sending them to the same ano place. This upper has a more similar finish to the aero precision finish. The slick side upper has a more doll & chalky finish. I like the price and feel there are of good value. Was this review helpful to you?

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September 2, 2022 : from Bluff City, TN United States   Was this review helpful to you?

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September 27, 2021 : James Willis from MURPHYSBORO, IL United States   Was this review helpful to you?

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In Stock & Quick Shipping September 17, 2021 : Raven from MO United States   MAS had the part I needed when no one else had it. The shipping was very quick indeed. Thanks. Was this review helpful to you?

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Best XL upper on the market May 19, 2021 : Johnny from NC United States   These are my choice of xl upper, great quality,  actually in stock and super fast shipping. Was this review helpful to you?

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Clever twist on an old theme. May 7, 2021 : Stephan from JAMUL, CA United States   The oversize port is a nice addition for the large rds. Was this review helpful to you?

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Couldn't be happier April 28, 2021 : Emmanuel Calderon   Was on a waitlist for months for a different brand xl upper receiver. Stumbled on this one while searching MAS Defense up after seeing one of their products on a social media post. Couldn't be happier with the service and product. Processing and shipping didn't take nearly as long as I thought considering the current events. The upper came well packaged, oiled up and in perfect condition. I'm definitely gonna keep MAS Defense in mind for my next purchase. Was this review helpful to you?

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Uppers April 23, 2021 : Jaimie Caro from Hawthorne , NY United States   As a New Yorker Mas Defense is now my go to source for quality AR parts and hassle free online ordering. No issues no problems. Was this review helpful to you?

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Quick shipping and good contact April 21, 2021 : Allen Honeycutt from Fuquay-Varina, NC United States   I have ordered a few times from mas defense and they have always shipped very quickly and communicate very well. The upper seems to very well made and feels very good. Was this review helpful to you?