Wow, cool! And you don't like those???

Seriously, the problem is that your texture mapping is wrong.

When you create (or borrow) a model, and you associate the model with a texture, the attributes of the model (arms, legs, armour, shields, and SPEARS) are mapped to different parts of the texture.

Basically, the mapping tells the model where in the texture to look for the colours associated with that object.

So what has happened here is that your new spear had an existing map that told it to look for colours in a part of the texture that was completely red. So you got red spears.

To fix it, you need to either use a different texture, or fix the mapping with 3ds Max 7.