LAUNCHER RELOADS

You said: "for reloading rocket launcher, grenade launcher etc, it using the same arm which having the gun for taking ammo, its look unrealistic"

Today, the arm that holds the tube also fetches the round, so the launcher seems to float. Below are four ways where one hand always holds the gun and the other hand does the loading, each shown for the rocket launcher and the grenade launcher at its real reload length (RPG 2.5 s, GL 2.3 s). In the reload, a green ring marks the hand holding the gun and a yellow ring marks the hand doing the work.

TODAY

your photo of the reloadSAME ARM: HOLDS THE TUBE + REACHES FOR THE ROCKET
RPG · reload start
RPG · the tube "floats"
GL · reaching across
GL · arms crossed over the gun
RPG · mid-reload
RPG · late reload
CLUSTER · mid-reload
CLUSTER · late reload
What goes wrong: the gun's grip stays on one hand while that same arm swings to the quiver / strap, so nothing is really holding the launcher. The fix in every option below: one hand never leaves the gun (or hands it over first), and the other hand alone fetches and loads.

FOUR WAYS

holds the gundoes the work
copied, paste it in chat