Great ideas but I think that this would just be too good...
Ranged AD carries are supposed to have high single target damage, they get Pentakills by tactically focusing each target one by one. This item would kind of remove tactical thinking and allow them to basically get free damage on enemies that they're not even intending to hit.
If you're an enemy support, trying to protect your AD carry you would pretty much just get destroyed with the bolts.
Idk, it's great that you're trying to make really cool and innovative items but this just seems kind of strong and unfair and defeats the purpose of balanced AD carries.
The particles also look too much like Lulu's passive and glitterlance. =/