Wilson Combat QDS Flip Up Sight System features a spring loaded deployment system that automatically flips the sight up at the push of a button. Front and rear sights lock positively in the folded and deployed positions and are precision machined from high strength but lightweight aircraft aluminum and hard anodized to military specifications. Easy, 1-minute installation on any AR with a railed handguard. Dual Peep A2 style small and large apertures are on the same plane for simple sight adjustment in the field. Each click on the rear sight will move bullet windage impact 1/2″ (0.50 MOA) at 100 yards. Made in the USA.