NFA item — $0 federal tax stamp. Order, we file the ATF Form 4 on eForms, you pick up at your SOT dealer after approval. Flat $14.99 firearm shipping.
Licensed FFL · Class 2 SOTWe file the Form 4$0 tax stamp
How the Form 4 process works
Transfers on an ATF Form 4 with a $0 federal tax stamp (as of Jan 1, 2026). We file the paperwork on eForms and keep you posted on status; you pick up at your SOT dealer with photo ID after ATF approval. How the Form 4 works →NFA & suppressor guide →
The Shadow Systems HS923 is a lightweight modular suppressor optimized for function on 9mm weapons. The suppressor includes a baffle stack extension which is intended for cases when the lowest possible sound signature is required. This means our suppressor is effectively two cans in one a small format can for cases where compactness is a priority and a longer format for when things need to be quiet AF. The HS923 comes with a x28 threaded piston for use with all threaded barrel Shadow Systems pistols as well as other tilting barrel handguns featuring this thread pitch. The can features a titanium blast baffle and a patent pending end cap which allows the pistol slide to be used as a wrench.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
