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

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March 24, 2026 : John Bunch from SALIDA, CO United States   Great quality Was this review helpful to you?

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Finish upper September 11, 2025 : Edward Hlavaty from Scott Township, PA United States   Excellent fit and finish, reasonable pricing and fast service and delivery. Couldn't ask for more. Was this review helpful to you?

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Great experience March 31, 2025 : Joshua Haus from Ironwood, MI United States   Great experience. Quality product. Excellent price. Was this review helpful to you?

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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?