The data miners state that this LTM limits players to dynamite, hunting rifles, and shotguns; all automatic weapons, traps and rocket launchers are gonezo. As well as that, shields will be outlawed (like cowboys, y'see?), and slurp juice will be the only way to replenish your health.
I suppose the wild west is popular at the moment as Red Dead Redemption 2 is still very fresh on everyone's minds, and likely will be until the end of the year. Hopefully those that were incorrectly banned will be able to jump on in time.
Fortnite Battle Royale is available on Play-oh, you know already.