The M4E1 Threaded Upper Receiver features a new angular machined design that helps it stand apart from standard mil-spec upper receivers. This upper receiver features the same enhanced body profile as our M4E1 Enhanced Upper Receiver but is threaded to accept a standard AR15 barrel nut. It is forged from 7075-T6 Aluminum and precision machined to work with all mil-spec AR15 parts.
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Monadnock Firearms is your online destination for firearms, ammunition, and tactical gear—shipped nationwide. Established in 2017 and based in Fitzwilliam, NH, we combine expert service with a seamless eCommerce experience. Proud supporters of Gun Owners of America (GOA) and defenders of the Second Amendment.
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