This fixed 4x magnification ACOG style Red dot is perfect for nearly all airsoft rifles with a standard picatinny/weaver railed upper receiver. This optic has the benefit of 4x magnificaiton for long ranged shooting with high visibility even in low light fiber optic iron sights for CQB encounters. The red dot has 3 color settings of red, green, and blue with variable brightness easily adjusted via the rheostat. The rear iron sight is adjustable as well. Made from lightweight and durable matte black finished aluminum. this scope is nitrogen charged and has specially coated lenses making it both fog and shockproof.