A few overlooked details about firearms

I remember in 2042 the revolver's cylinder could still rotate, so why can't it be seen rotating here?

Also, in 2042, shotgun shells were categorized using different colored bullets, so why are they all the same model in Battlefield 6?I don't know if it's because the engineers were being lazy or just forgot, but I think that even in real-life wars, different bullets for shotguns or other guns would probably be distinguished by other means or colors.

Oh, and another thing is that when I pick up a weapon pack from another class on the ground, my gun will basically disappear 100% of the time, but I can still shoot. When I reload, I can see the body of the gun, but it still disappears from the screen. When I switch to the secondary weapon and then switch back, the gun appears normally again.