TexasCHLforum.com

read letter, read description of the action, didn't watch video
looked to me like it Resets the trigger allowing it to be pulled again by the description, so the letter from ATF stating multiple rounds from a singlet rigger pull appears to be in error
i think i recall in the 1980s there used to be a spring for 22 caliber rifles that reset the trigger and atf said it was ok because it required a separate trigger pull for each round, also a crank with manually rotating wheel with 3 flaps for 3 trigger pulls per rotation which was approved but illegal if a motor was attached to the rotating flapper