The 24th amendment very specifically bans polling taxes

The right of citizens of the United States to vote in any primary or other election for President or Vice President, for electors for President or Vice President, or for Senator or Representative in Congress, shall not be denied or abridged by the United States or any State by reason of failure to pay any poll tax or other tax.

Is there an amendment that bans a tax on gun ownership?

If not, then your argument has no standing