>>9519147you ever see how people bitch about how a figure can't hold a gun or sword realistically? Most people say that the sword way is the wrong way for the gun way.
By having swivels on both ends, you can have the character putting the right amount of flair into it for either swords AND guns.
Anyway, the reason for the difference is just budget. It's cheaper to do it how Hasbro does it, whereas McFarlane's is an extra piece that needs to be produced.