This is the pistol version of the desirable SIG 556 rifle. It has a folding blade front sight with a picatinny style mounting rail running the length of the upper receiver and all four sides of the forend, and the factory installed birdcage flash hider, and rear pistol grip. Mounted on the top receiver rail is a Sig STS-081 mini red dot sight. This lot is complete with a zipper carrying soft case, three magazines (total), papers and a separate MAKO forward pistol grip (not attached).