They have been becoming more rare because there is a federal import ban on "non sporting rifles" ... this is why Saigas had to come into the US with sporter stock rather than a pistol grip.
Since 3 gun is a sport now. I think a good lawyer could challeng it.
There is nothing to challenge. They are not banned. This is how "Back door gun regulation" works
Edit: This will not be fixed at the ballot box either until we drain the swamp. This import ban was put in place by Bush senior.
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