The warrant says the investigation began March 11 with a routine search of packages coming in from China at a DHL hub warehouse in Morrisville.
An investigator with the North Carolina Secretary of State's office was assisting Homeland Security with the search when an inspection of three packages addressed to a home in Cary were found with sights inside for AR-15 rifles.
The sights were marked with the A.R.M.S. brand name, but when investigators checked with A.R.M.S., they were told the parts are fakes.
Investigators got a search warrant for the home in the 1000 block of Daybreak Bluff Drive, Cary where the sights were headed and confiscated 1562 gun parts - including sights, scopes, replacement stocks and gun mounts intended for AR-15 and M4 rifles.
826 of the parts are marked "counterfeit" in the search warrant descriptions.
ABC11 has learned the search and seizure is part on an ongoing investigation. No charges have been filed.