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I suppose you could make an argument that if you welded over the gas hole in your barrel, removed the gas tube, and had to manually charge the weapon after every shot, the weapon is no longer semi-automatic, and cannot be readily converted back to semi-automatic.
Never heard tell of it ever being done, even in California. There, they get around the issue by using a "bullet button" in place of the standard magazine release, thereby making the rifle technically not having a detatchable magazine. I highly doubt that New York would look upon the same modification in a similar light, though.
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Actually, here in CA there were some pump action AKs, prior to the whole bullet button movement. If at all possible, the same thing will be done to ARs. The mods done in the UK could be done here too.
However, this may only end up being applicable to any Federal Ban (DiFi's bill specifically exempts any "manually operated" firearms from AW classification, no doubt to allow these modifications. We went through the same thing when detachable mag SKS's were made illegal here - they allowed conversions to fixed magazine.). It may also apply to new CA laws. NY's bill is so badly written and so tight that the only hope NY gun owners have is SCOTUS.