Magazine Fed .50 BMG AR Upper: McCutchen Firearms’ MF-50M

McCutchen Firearms has released two precision .50 BMG upper receiver assemblies for AR-15s, featuring the proprietary Mechanically-Assisted Pin Safety (M.A.P.S.) system. The MF-50 has been released in both singleshot (MF-50S) and magazine-fed (MF-50M) versions.

“We think we’ve created the perfect product for shooters who’ve been wanting to own a .50 BMG that is more affordable, more accurate and safer than ever before,” according to McCutchen Firearms President, Andrew McCutchen.  McCutchen, a mechanical engineer with 15 years of product development experience, and his team of engineers and machinists, developed the.50 BMG upper assemblies and the M.A.P.S. safety system, in response to consumer demand.

“Our market research indicated that many shooters want an affordable .50 BMG
rifle, but hesitated in buying .50 BMG upper assemblies for their AR-platforms out of
concerns about the quality, accuracy, reliability and safety of products that are
currently on market. The MF-50 is the result of our team analyzing some of the best
ideas that we’ve seen and adding over a year of our engineering and manufacturing
expertise, to meet and exceed the customer’s expectations.”

The patent-pending M.A.P.S. system features a mechanical interface that both blocks the firing pin until the bolt is in battery and also provides a mechanical assist in driving back the firing pin, after firing, thereby addressing two known safety issues that exist with other .50 BMG upper assemblies on the market.

“Nothing beats a great day at the range shooting a .50 BMG, accurately, safely and
affordably,” McCutchen concluded.

The MF-50S and MF-50M are 100% made in the USA and are in stock and ready to ship. Both the magazine-fed and single-shot versions are available in two barrel lengths and with two different brake options. They are also available as a complete rifle for those that don’t want to sacrifice their AR-15 lower.

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