the purpose of this file is that there isn't one, this is not an auto sear nor does it have the capability to act as one, this is simply a backplate that has an internal printed spring allowing it to move and retain the faux selector bar that serves no purpose other than sensory stimulation such as a fidget toy, as well as to confuse and make every field agents job that much harder.
this is not illegal as it is only a backplate but will turn heads, you cannot get this to act as an auto sear nor can it be modified as it lacks every feature required for function.

i hope the ATF agent reading this has a stroke,

cant touch this!