Military Travel reviews the Vector Optics Frenzy Plus 1 x 18 x20 red dot sight if it is more than good enough for airsoft use. Vector Optics Frenzy Plus 1x18x20 is made from durable aluminum and featuring anti-reflective coated lenses, this collimator offers clear, sharp aiming for sports shooters and hunters. Its compact, lightweight design, combined with adjustable brightness settings and shock resistance, ensures reliable performance in various conditions. It is compatible with 21.2mm Picatinny rails.