What is one type of prohibited firearms accessory?

A silencer, also known as a suppressor, is considered a prohibited firearms accessory in many jurisdictions due to the significant reduction in noise it provides when a firearm is discharged. The primary reason for prohibiting such accessories often relates to public safety and concerns regarding the potential for criminal misuse. Suppressors can make firearms less detectable, which raises the risk of their use in illegal activities without attracting attention. In contrast, optical sights, grip tape, and spare magazines are generally considered acceptable accessories that can enhance the functionality and usability of firearms without the same level of risk associated with sound suppression.