[quote=@Durandal]
<Snipped quote by MetalLover>

What allowed, large, solid-state lasers, tank rail guns, or both?
[/quote]Both are apparently allowed.
Solid-state lasers aren't THAT big and decades of development can certainly shrink them down.
We already have laser point defenses thanks to Rheinmetall. They are sure not as OP as portrayed in sci-fi. They are a nice way to compliment your already long list of countermeasures.

As for Railguns...well, they  have issues in general.
Power requirements (same as big lasers in the MW range), wear on the rails (IIRC about 30 shots prior to replacement) and issues with the ammunition options.
Actually, I think I may stick with the "conventional" cannons.
The navy is interested in railguns because it'd give them a cheaper alternative to missiles and rocket-assisted projectiles when bombarding from range. The raw velocity of the projectile turns it into an explosive.