patf wrote:
Could they not argue if you did a trigger replacement, or even polished the stock trigger so it worked smother that you may be enhancing the fire rate? And who defines what is a part that could be used as part of a component to speed up firing? Could an average screw be such a part?
ATF would be tasked with defining what would and would not run afoul of this law. They would issue opinion letters like they have done with bump stocks and Sig Sauer arm braces (for example).
COULD they go as far as you suggest? Sure. But, it is doubtful. A trigger job typically isn't done to speed up fire rate but to increase accuracy and break point. Muzzle brake controls recoil. Etc., etc. I don't think it would be taken that far, but certainly is COULD.
Now, what WOULD be on that list? The Fostech Echo Trigger. That's the trigger that allows a "double fire" with each trigger pull. One round fires when the trigger is pulled. A second round fires when the trigger resets. Thus, it fires two rounds with one trigger pull. No question that would fall under this law.
EDIT TO ADD: Here is Franklin Armory's Binary Firing system, which is like the Fostech Echo Trigger:
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