US Patent 9733045 Folding sight assembly

A folding sight assembly, comprising a housing having a lower region that is configured to hold a crosslock, and an upper region comprising a catch plate separated from a windage adjustment plate by a space. The assembly comprises a shaft and an engagement spring. The engagement spring comprises a longitudinally extending body that turns to form a retaining loop portion comprising an arcuate-shaped member having an opening formed therethrough. The shaft is disposed through the opening of the engagement spring and within the space formed between the windage adjustment and catch plates, and the engagement spring is further engaged with the housing and the crosslock to secure the component parts of the folding sight assembly to one another.