So I bought RE4 on Steam, because I've heard so much about it, and so far I'm having a blast. Gameplay is great, except for the bit where the game chooses to throw literally hundreds of thousands of dollars at me instead of ammo. I'm at the castle right now, and with the whole 'defend Ashley while she rotates things' section, I realized that the game was telling me to buy a rifle.
How the hell do I rotate items on the keyboard and mouse for the rifle to fit in the case? I've been trying for a while now.

@adequatelyprepared: If I remember correctly from the awful old keyboard controls of the first port. You have to press backspace to lift it and then I think it's either SHIFT or F to rotate.

Backspace and then Page Down.