"A set of various parts consisting of a scope and a scope mount. Equipping these on a handgun will greatly increase the gun's firing precision."
The handgun parts can be found in a duralumin case in the basement of the Umbrella Research Center. These accessories may be attached to either Rebecca's Samurai Edge or to Billy's Army Handgun.
Handgun parts on Billy's gun.
Handgun parts on Rebecca's gun.