Rigid bore scopes are similar to a fiberscope, but are not flexible and generally much cheaper and provide a superior image. Rigid bore scopes are therefore better suited to certain tasks such as inspecting automotive cylinders, fuel injectors, hydraulic manifold bodies and gunsmithing. Rigid or flexible bore scopes may be fitted with a magnifying device and a way to illuminate the work being inspected, usually illumination fibers are contained in the insertion tube of the bore scope. The eyepiece may be fitted with a coupler lens to allow the bore scope to be used with imaging devices such as a video or CCD camera.

This rigid bore scope is only 175mm long, so it will not be long enough to do inspection of a rifle. But you can choose longer scopes to do it. For example 300mm long and 4mm diameter.