Ok so I saw this situation in the middle of a game and it struck me as really odd. I never thought twice about it when I GMed.
A person entering melee with a rifle can he or can he not melee while holding his rifle?
The alternative at hand was to drop the weapon to use your hands or to spend a turn, turning it into a improvised weapon. Of course you couldn't parry ect,. I think I just ran it as if you were unarmed in my games.
It would seem to me a huge disadvantage to any ranged PC if the melee characters could all basically lock them down for one round while they ready up.