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  1. en.wikipedia.org › wiki › M4_carbineM4 carbine - Wikipedia

    11 hours ago · Feed system. 30-round detachable STANAG magazine [a] Sights. Iron sights or various optics. The M4 carbine (officially Carbine, Caliber 5.56 mm, M4) is a 5.56×45mm NATO, select-fire, gas-operated, [b] magazine -fed carbine -length assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle .

  2. en.wikipedia.org › wiki › ChicagoChicago - Wikipedia

    11 hours ago · Chicago is an international hub for finance, culture, commerce, industry, education, technology, telecommunications, and transportation. It has the largest and most diverse derivatives market in the world, generating 20% of all volume in commodities and financial futures alone. [15]