Hmmm weapon problem

[BRUm]

RIght,

 

I made a simple mod, which is just the bat, with sharp studs and is about 1.5 times bigger than the original. When I use this weapon against objects like peds or cars, the extended bit of my weapon doesn't collide with anything, only the part where the original bat is. I basically made the bat model 1.5 times bigger, should I edit some collide files or something in order for my extended bat to recognise stuff?

 

Thanks