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20 hours ago · Many manufacturers offer production firearms that are essentially identical to a military M4, but with a 16-inch (41 cm) barrel. The Bushmaster M4 Type Carbine is a popular example. Civilian models are sometimes colloquially referred to as "M4gery" (/ ɛ m ˈ f ɔːr dʒ ər i / em-FOR-jə-ree, a portmanteau of "M4" and "forgery").