In my experience the muzzle looks exceedingly larger than that.
I never saw the RPG that shot at me.
The few times I’ve been shot at I didn’t see the shooter. The time I saw the muzzle was a 12ga held by security in a use of deadly force authorized area. He hadn’t received the all clear yet from downstairs that the nuclear codes were indeed secure. I saw a muzzle and a twitching trigger finger.
The other time was a really pretty North Korean spy but I don’t think that counts.
Some said that being shot at by a 45 hollowpoint is like having a trash can fired at you.