Sight
A grooved receiver is a part of a firearm where the scope mounts are attached. It has grooves or rails that allow for the mounting of a scope or other optical sighting device onto the firearm for improved accuracy and precision in shooting.
No, its not an optical storage device.
It is not an optical device. C D ROM or DVD are optical devices. Whereas a digital memory card is solid state device.
An image produced by an optical device, such as a lens, is a representation of the object being viewed. It can appear similar or identical to the original object, depending on factors like focus, distortion, and magnification of the lens. The likeness is a visual representation that can be captured and recorded for observation or analysis.
The correct spelling is auxiliary (assisting or supporting, or an assisting device or group).
It would be classed as a destructive device, not a firearm.
magnetic storage device
CD-R
Input device
Optical equipment is any device that uses light to perform its function.
A device to measure optical refraction.
OCR, optical character reading device, OCR device...