Geissele Automatics URG-I, Near Clone, Complete Upper Receiver, 556NATO, 14.5 (16 OAL) Barrel, 1:7 Twist, Pinned and Welded Surefire 4 Prong Flash Hider, Desert Dirt Color 13.5 SMR MK16 M-LOK Free Float Handguard, Desert Dirt Color Geissele Airborne Charging Handle, Geissele Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black, Includes Super 42 Braided Wire Buffer Spring and H1 Buffer Combo 08-159 For more than 50 years the famed silhouette of the M16/M4 has only had one major and several minor changes. Barrel lengths and buttstocks have changed" but more or less the evolution of America's right arm has proceeded apace with each generation of warrior making her their own. In that time" the sight of the M16/M4 in the competent grasp of young Americans has meant hope to countless millions of people around the globe.