What do you know about the M4 Carbine? The M4 Carbine is a 5.56 x 45mm Caliber Rifle. It has a maximum range of 600 meters. By Task & Purpose | Published Apr 28, 2020 9:07 PM Reviews Gear SHARE The M4 Carbine is a 5.56 x 45mm Caliber Rifle. It has a maximum range of 600 meters. Task & Purpose air force carbine gun... m4 m4 carbine MORE TO READ RELATED The 49 best Black Friday deals on tactical gear at Amazon Score the best deals on tactical gear from knives to flashlights on Amazon. READ NOW RELATED The best Cabela’s Black Friday deals on shooting, hunting, grilling, and more Score the best holiday gifts through these Cabela's Black Friday deals. RELATED The 47 best Black Friday deals on fitness gear at Amazon, Walmart, and beyond Score some fresh fitness equipment for a tidy Black Friday discount at Amazon and Walmart.