These kits can be “assembled into fully functional firearms in a matter of minutes,” the warrant application says. But the Buy Build Shoot Kits, which are advertised as having “all the necessary components to build a complete…pistol” weren’t submitted to the agency for approval, according to the application for the search warrant.

The ATF previously gave Polymer80 permission to sell unfinished receivers. It appears that the ATF may have once again changed their definition of a firearm and now considers Polymer80’s Buy Build Shoot kit the equivalent of a firearm, requiring serialization and a transfer through an FFL. That means it would have to be stamped with a serial number and couldn’t be sold to consumers who haven’t first passed a background check. The kit, which Polymer80 sells online, meets the definition of a firearm, ATF investigators determined according to the warrant application. The probe focuses on Polymer80’s “Buy Build Shoot Kit,” which includes the parts to build a “ghost” handgun.

The raid target, Nevada-based Polymer80, is suspected of illegally manufacturing and distributing firearms, failing to pay taxes, shipping guns across state lines and failing to conduct background investigations, according to an application for a search warrant unsealed Thursday after the raid took place.

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