And that's why it is so hard to model weapons for this game. Since single rockets are really not powerful in this game and you have to carry around a lot of them, a tube system will actually look really weird. Single rockets/projectiles would be a lot more logical. If we had a weapon system with really strong missiles, but low ammo count, a tube system would make sense. TLDR: Design has to follow function. Sometimes we forget that.
so what? you neither see where he carries all the rockets either. if the animations look well enough, noone will care. you maybe notice eventually, but you shouldnt have the time to look at someones RPG anyway ... couldnt you just spawn a physics entitiy, dont worry about any animations anymore and just fade it out after x seconds? very similar to how brass ejection works? sure, this isnt in the hands of an artist anymore, its something a coder would have to care for, but its not impossible?! isnt it the fact that its no realistic/a fictional game? else you can just go to blueprints.com (or how its called) and get you some blueprints of real weaponry ... ... imho fictional stuff is the hardest. even if in theory you could do everything, our brains still demand some explanations/reason and if it shows absolutely no real world resemblance its easy to break immersion. for me the hardest part (by far) is making believeable things that dont exist. especially since it also is dependent on your audiences knowledge on that matter and their willingness to accept it (if you go look for oddities you most certainly gonna find them in almost any fictional model)
it would be cool if the gren would rip of the tube and throw it away as physics object before he attaches a new one. but it doesnt make animations easier i suppose
Gigantic Tube that has the only purpose of shoot off the rocket inside, and after that it can only be thrown in the junkyard. Such a waste of material and space... You can as well have Huge Pistol that only has 7 .50-Caliber Bullets, and after all of them are shot, you can only throw it away, because it can't be reloaded. Logic.
Those types of RPGs are using a type of granulate in the barrel, to increase thrust. Downside is, that that stuff melts and can't be used a second time. That's why you have to replace the whole tube.