Pack 'a Punch: FUSION

I've produced a follow on movie to the "Pack 'a Punch: FUSION" gun ideas video that I have shown before which details the other function of the machine (which was pretty much ignored before), "breeding" guns together to create a bloodline with each gun holding influence from those that you have held before. Its a little complex buy once you have you head around it, its rather simple and I believe to be the best and most original idea of the lot. Anyway I'm interested in peoples opinions on this idea and any ways in which the idea could be expanded, for example there could be unlockable "equation multipliers" as you level up (if ranks are added to zombies) which increase certain abilities of the guns as they are fused. Let me know if you have anything to add. Heres the vid series,

Pack 'a Punch: BLOODLINE http://www.youtube.com/watch?v=MlqA4q75LOQ

Pack 'a Punch: FUSION http://www.youtube.com/watch?v=mBYPOiga4og

Full 35 page ideas document on youtube http://www.youtube.com/watch?v=VarcFns7SCY

Hope you enjoy, the gun models were done in the same program treyarch uses so they can (if it comes to it) be integrated into a mod.