AS WRITTEN IN THE CORE RULEBOOK
"The Explorer has practiced so frequently with his weapons that they practically leap into his hands, ready for action. He can Ready as a Free Action when armed with a pistol or basic class ranged weapon, or a melee weapon that can be wielded in one hand."
No the word "stow" doesn't appear anywhere in there so stowing a weapon is still a half action unless you buy the magnetic holsters from the DH armory or buy some other talent that I'm not aware of. I don't know why it is you're always arguing for excessive permissiveness but I've noticed in the last few days almost every time someone said that some sort of craziness should not only be permitted but is fully sanctioned by the rules it's been you.