Those are great. The biggest issue I see in the second one isn't the gun. It's the foreshortening of the hand. It's not quite right. The hand needs to be bigger if you are going to have it point straight out of the page. Try taking a picture of yourself in that pose in the mirror.
I wait.
See how your hand is bigger? ((I know you didn't take it, but I'm pretending you did, because it's fun.))
I wait.
See how your hand is bigger? ((I know you didn't take it, but I'm pretending you did, because it's fun.))