M4 carbine M16 rifle

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an m4a1 carbine (foreground) , 2 m16a2s (background) being fired u.s. marines during live fire exercise: though adopted in 1990s , derived m16a2, m4 carbine part of long line of short-barreled ar-15 used in u.s. military


the m4 carbine developed various outgrowths of these designs, including number of 14.5-inch (368 mm)-barreled a1 style carbines. xm4 (colt model 727) started trials in mid-1980s, barrel of 14.5 inches (370 mm). officially adopted replacement m3 grease gun (and beretta m9 , m16a2 select troops) in 1994, used great success in balkans , in more recent conflicts, including afghanistan , iraq theaters. m4 carbine has three-round burst firing mode, while m4a1 carbine has automatic firing mode. both have picatinny rail on upper receiver, allowing carry handle/rear sight assembly replaced other sighting devices.







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