The Shadow Systems HS923 is a modular suppressor designed for use with 9mm firearms. It is configured for direct-thread attachment and includes a baffle-stack extension that lets the unit function in a shorter, compact configuration or a longer configuration for increased sound attenuation. The unit ships with a 1/2×28 threaded piston to fit compatible pistols and other tilting-barrel handguns using that thread pitch.

Key Specifications

• The intended caliber is 9mm.
• The model designation is HS923.
• The listed material is 7075 Aluminum.
• The finish is specified as Anodized.
• The color is Black.
• The NFA thread pattern is 1/2×28.
• The NFA attachment method is Direct Thread.
• The overall length is listed as 5.33″ to 8.18″.
• The reported decibel reduction range is 24–33 dB.
• The listed weight value is 1.0.

The HS923’s modular design accommodates users who require a compact profile in some situations and increased sound attenuation in others. Its direct-thread piston and modular stack extension make it a practical option for a 9mm setup where adaptability and lightweight construction are priorities.