Bill Akin invented the Akin's accelerator which was a bump fire stock for the Ruger 10/22.
At 1st the ATF approved it, It was an immediate success and business took off.
The AA went into full production.. about 2 years (iirc) into it the ATF did another test on the AA, why they did another test im not sure.
Anyway this time around they denied it, They claim was the 1st test the product did not work. the 2nd test done a few years later it did.. They accused Bill of sending them a prototype or otherwise flawed unit.
The stock worked via a spring. The ATF got a court order for bill's customer list as well as all springs in inventory.
Without the springs the stocks was worthless.
The ATF also sent out letters to everyone on the customer list demanding they send in the springs from their stocks and sign an affidavit that they would not replace them to make the stocks functional again.
Bill went to the NRA for help as he did not have the money to fight the ATF, He was a member for about 30 years (IIRC), They declined and so Bill was forced to comply. He was left with about 1ml dollars in useless product, Customers who complied with the ATF was left with a useless stock.
The ATF did not compensate customers nor Bill. The stocks cost about 1k dollars iirc, While customers might be out 1000 dollars Bill had spent 10 years perfecting the product and was ruined financially.
He was secure in thinking his ATF approval letter was a green light, Only to have them reverse 2 years later ruining his business without compensation.
At least thats the story in a nutshell, google Bill Akin or Akin's accelerator if you want to read more...........Joe Sixpack