So I thought I was being smart by buying G1 Ultra Magnus Missles to replace the hideous missles that the Comm one came with. Also I tried to replace my Comm Perceptors gun with a vintage so it could fire.

I was 0-2. So use my money spending as your example. Vintage G1 weapons don't play nice with Reissues/Comm/TFC missles and vice versa.

 

Well, if you're mainly looking to display them and not shoot cats or whatever, then I'm sure you could make things work with a little... science & surgery.  

 

Why did I just suddenly get a mental image of G1 Wheeljack and Prime Knock Out together, possibly on some project that could blow up in everyone's faces?

 

Yup, I was hoping that I would be able to bypass that, but guess not!

 

Let's add the morally ambiguous TransTech Shockwave to the mix while we're at it... Or how about SG Ratchet? They'd all get along just fine! >_>

 

Well, a little science (Crazy Glue) and Surgery (Big ass butcher knife and sand paper), I have 2 small sized Ultra Magnus Missiles. Best part is that they shoot further then the original G1.

Worst part, I no longer have a 100% complete Commerative Ultra Magnus. I now have a custom UM.  

I just hope no doctor thinks a butcher knife and Sand paper is consider surgical equipment.

NEED HELP:

Well now I want to see if I can make my commerative Perceptor fire his gun. Does anyone know how to use "Science" to make it fire again?

 

No idea dude. I just plant the seeds. You'll need to find someone else to actually water & make em grow.