Viper, we already have 240cm railguns and since you're massive gun is much larger IG, I will bump it up to 480cm, almost the same as the diameter of the "OB-1 plasma rail gun", only yours will hurl projectiles.
Awesome Viper! I'll post it in the AFOH page soon.
Also, why don't you retrofit your massive railgun to your flying ships. This will give them a capability rivaling the MACs of the other navies. I'm even thinking of doing the same to the Richelieu aerospace battlecruisers (a "Flight II", while the "Flight I"s will continue to mount the OB-1 plasma railgun).
Viper, the "ASMRG" looks like a ship to me, and so it should have a name. The actual magnetic railgun, and I assume it's the long dark rod in the middle, should be able to fit into the ships currently armed with the OB-1 plasma railgun.
Given that our aerospace ships are "fusion-powered", I also assume that the last 2 weapons are smaller derivatives of ASMRG which can fit into smaller aerospace battleships and escorts.