Mission First Tactical Flip Up Rear Sight -Unlike other backup sights MFT has developed a shroud that shelters the aperture from debris and impact damage when not deployed. A slim profile allows the sight to sit under all current magnifiers and optics. Manufactured using a specially developed Military Grade reinforced, super tough polyamide, MADE IN THE USA. Low profile snag resistant designShroud protects aperture from debris and impact damageDual peep, same plane aperture allows for perfect co-witnessInfinite MOAUnique closure with either aperture deployedCan fold to the rear, the correct direction if droppedSight works in conjunction with all standard height front sightsManufactured using a specially developed Military Grade reinforced, super tough polyamideFlip UpWeight-.5oz Width-1.08 inchesHeight-.879 inchesLength-2.23 inches Made in the USA