Springmom, . . . it's one of those mall ninja trigger adapters that lets everyone find out that you really are un-hinged when you break out your .22 cal assault rifle (in full camo's and face paint).
It also allows everyone around you to see for sure that slow, deliberate, sighted shooting always produces more and better hits than full auto or "mall ninja" full auto with a hell fire device.
May God bless,
If you can breathe, . . . thank God!
If you can read, . . . thank a teacher!
If you are reading this in English, . . . thank a Veteran!