The SSP18 Rectangular Amplifier in Black effectively amplifies sound by utilizing a conical opening at the muzzle end of the barrel. This feature serves to intimidate any potential opponents and provide cover. Additionally, the amplifier's Full CNC Hard-Anodized design makes it suitable for use with holsters, and it can be used with all ~16mm OD thread covers, though it does not have its own thread. To mount it on the SSR90, the SSP18 Thread Protector is required.