That also looks like the one Gary Busey used in Lethal Weapon in the gun fight in the street at the end of the movie. Check it out. It's dead on. The only reason I know that is I watch those movies whenever they are on. Takes me back to my younger days.This is still my favorite Vietnam Era model. Reminds me of old Magnum P.I. episodes.View attachment 1103612 This one looks to be a 16" non SBR copy of the XM177 but yall get the point. I love the short triangle hand guards and the old 20 round mags.