The M4 Patrolman's Flat Top Rifle from Bushmaster Firearms. Handcrafted in America and Proven to perfection it's the ideal rifle for duty recreation and sport shooting. Featuring a 16" 4150 CMV barrel with salt bath nitride finish carbine-length gas system and Midwest Industries Inc. Combat Rifle rear flip sight. Lightweight and compact it includes a 30-round aluminum BFI magazine making it the ultimate choice for those who demand the best.