Make Aphilios An Actually Complex Champion (Without Breaking Him)
I honestly think his passive (and maybe his ability) numbers should be tuned down some, but I will leave that out of this. I'm just looking at the function of his kit.
Instead I propose that his ammo count system gets removed. So yes, he can potentially keep a weapon indefinitely, BUT ....
Using Q or R will automatically swap his main-hand weapon with the next weapon in succession.
Further, Q no longer has a unique cooldown for each weapon, HOWEVER using W will reset the cooldown on Q. This reset can only happen once per 12 to 8 seconds based on level and is reduced by CDR.
Why? With as strong as his abilities are, deciding to use them should be impactful in the overall usefulness of his kit. If you need to make a super long range snipe with Calibrum, that should cost you the ability to poke with extra range on your basic attacks, ... for a little while.
This would actually allow the player to cycle through weapons much faster and with control.
For clarity, lets use 1 to represent Calibrum, 2 is Severum, 3 = Gravitum, 4 = Infernum, and 5 = Crescendum
You start with Calibrum (1) and Severum (2) ... or 1(2)
1(2) Q > 3(2) W > 2(3) Q > 4(3) R > 5(3)
Ending with Crescendum and Gravitum in a matter of seconds.
If you wanted to always keep a specific weapon, you can, BUT you can't use the Q or R from that weapon or you lose it for a while. This also means if you are farming with that weapon and you want to use your Q or R, you need to first use your W to swap to your other weapon, telegraphing your intent in using those abilities.
I think this would make him a lot more fun to be honest. Knowing what order in which you should use his abilities and what weapon combination that would give you would make him a challenging champion to master.
Also, by slowing the pace down a little, you get more control over what weapon you keep. I think this gives players the ability to keep a certain play style to stick to based on their preference or the situation.