>>521768
Well, it's made of all kinds of polymers, and you can't use it with a bipod. If everything goes well, then in a few years we will have cheap steel-aluminium alloys that are as dense as titanium, but are even stronger, so even a thinner tube is good enough. Now, I can't even think of how far reaching the effects will be, but 60mm mortars too will be very light, so this will look like a waste.
Also, at 4.9-5.3kg it's indeed stupidly light, but a 60mm shell is still about 1.7kg. An M224 in handheld mode is about 10kg, so you've saved ~5kg. It's nice for the grunt who has to carry it into battle, but you can bet that an officer will make him carry the difference in shells. And 3 shells weigh 5.1kg. So it's not that much of an increase. But if those shells were only 1kg, then this mortar would net 5 extra shells. Not to mention that the whole loadout would be significantly decreased, thus the number of round increased. An other benefit could be the increased range, but then you'd need new sights for the new ballistics, so it might be better to just replicate the trajectory of the heavier shells.
>>521587
Well, just put an autoloader on the 2S4 Tyulpan and you have it. But then the amount of ammo carried would be rather low, so you'd have to escort it with at least a few trucks that carry more, and then you should put some other units next to your mortars that protect then, and then you indeed end up with a mobile firebase as >>521878 said.
>>521908
A 155mm shell's weight is about 50kg, give or take. A 240mm mortar shell is 130kg. Just look at vid related to see how big they really are.
>>521837
>Why gunsmithing and not mechanical engineering?
You can't even touch a gun if you aren't a gunsmith. Look at this site: http://www.neogravir.hu/index.php/galeria-2/puskak/
The man who made these too had to attend the same school I'm going to, because temporarily having the sideplate of a bolt-action rifle is apparently illegal if you don't have the paper to modify firearms. Even replacing the barrel of a rifle you own is an act that could put you in prison, because it's the same as building a brand new firearm according to the law. And if people a hundred years ago could invent automatic weapons with nothing but pen and paper and their own imagination, then I'm sure that I can make something useful with the help of CAD programs and more than a hundred years of research in this area.
>The political science isn't entirely useless
It is, believe me.
>I know you post on /pol/ because I can recognize the weeaboo images you post here and there.
Well, I rarely if ever post on /pol/ since the elections, and I usually post weeabo images I find on /a/, so there is a good chance that it wasn't me. Although it's not impossible.