found that today that g-lynx and lynx has wrong weight of maximum armament i should be able to have the armament but on lower line it says its over weight.
gaijin fix it
You can bug report it here (just search a bit first so that you don’t report something that is already reported and known about): (Gaijin.net // Issues)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)