I know I should know this, but can I change the front sight fiber optic rod to the a larger (diameter) rod and fit into the original front sight drilling? The dot is just way too small for me to pick up (like the orange better anyway). Or do I have to replace the front sight altogether?

Well, you can't put a 1.5mm rod into a 1mm hole.

If you want to experiment with it, you can vary the size of the knob you melt up on the end.
Fibre is $6 a metre at http://www.fiberopticproducts.com/Archery.htm
so there is maybe a hundred tries.

The sight on your X5 is a Dawson, and they are small. I wouldn't try drilling it out, I highly doubt it'll work.
Ameriglo's fiber optic front sight is larger in diameter, you might try that. I don't know what the width of that sight it though, might fill up your rear sight.

I cut the fiber out,per the instructions,and then use a lighter to mushroom the end of the FO rod.

I then slide the rod into the sight, trim it to the proper length and use the lighter to mushroom the untouched end of the FO rod.

This allows me to make the FO the same width as the sight blade.

I buy my FO rod by the meter. When it get all funky I replace it with new rod.

Bob

thanks all for the responses. I'm new to FO,never changed one (till now) so I wasn't sure of the possibilities. Seems to be sorted out now.

Broke out the original Green FO, replaced with the Red but when torching the (viewing) end I melted a little more and longer which made a larger bead for me to now see.

Also it seems that the green FO shines less than the red so it looks smaller.

live and learn.

Most people find green brighter than red given the same size dot, but a larger bulb on the end will look brighter than the original, regardless of the color.