RE5 Upgraded Guns Question

So while i am still playing this game taking my time and enjoiing the game I have a question that no one has been able to answer for me yet. I have 2 guns fully upgraded now and am working on building up other guns but am short on money can I sell the guns I have upgraded since they are worth so much and have them still count towards the trophy or do I need to keep them in my inventory and have them all at once like having all 4 eggs ?

That's tricky...Because once you fully upgrade a weapon, it shows up under special features. But I'm not sure if that means it records it for your purpose as well or not. It's kind of a waste to sell your upgraded guns anyway though. If I were you, I'd just play through some of the temple levels for some treasure. Tough question.

No, its just like the eggs... its like you need proof or something .

I have a related question.

I've upgraded the MP5 to max and am currently trying to finish up doing the same to the VZ61 Skorpion.

Now, in bonus features it says to upgrade it and complete the game to get infinite ammo. Does that mean any subsequent MP5s I find or buy will also have infinite ammo?

I'm pretty sure once you fully upgrade any gun AND beat the game AND spend the points to unlock that guns infinite ammo, any one of the same gun will have infinite ammo. I don't think you have to fully upgrade another MP5, in your case, just to have infinite ammo for it as well.