Add a Scope or Laser to your M2HB or M3 .50 cal. Multiple Picatinny Rail, 6″ MIL STD 1913 Picatinny rails on left, right and top. Slides over the top plate. Two adjustable positions on each side and three on top. M2HB Sights are viewable under the tri-rail mounting system. Currently in use by the US Military. New condition.