Hmm... well IMO, if Sol is going to have Flak weapons, I think it has to work differently compared to the GTVA Flak guns. Different scientists have different ways of tackling a problem... stuff like that.
Sure, coincidences do happen, but I find it rather hard to believe that both sides' Flak guns end up being
exactly the same...

Perhaps make Sol use the cluster flak (whatever that is) first, then intro the 'regular' Flak guns only in INF SCP (e.g. they saw the GTVA using this style of Flak, and it's deadly in its own way, so they modded their own Flak guns to try and copy the GTVA version)? Just my suggestion though.
Cluster flak? What is that?

[OFT]omg, 5:05am.[/OFT]