The (standardized by the U.S. military as the M107) is a semi-automatic long-range sniper rifle.
Thomas Alvarez (original), cropped by <a href="//commons.wikimedia.org/wiki/User:Voello" class="mw-redirect" title="User:Voello">Voello</a>
Crop of <a href="//commons.wikimedia.org/wiki/File:191003-Z-XK920-1043_-_M107_.50_Caliber_Sniper_Rifle_(Image_1_of_14).jpg" title="File:191003-Z-XK920-1043 - M107 .50 Caliber Sniper Rifle (Image 1 of 14).jpg">File:191003-Z-XK920-1043_-_M107_.50_Caliber_Sniper_Rifle_(Image_1_of_14).jpg</a>