I don't like to copy off of peoples modles or pics most of the time so I am giving you my reference link that I got from google that I used from online and also my first gun picture in blender right here:
And for this image I pulled it back more than it is supposed to go but i just wanted to show you that the back of the chammber is there. Also to show you that I use multiple mesh so that I can animate more. I dought that I am going to animate the top front part of it but I pulled it up to show you.
I am putting this in the game blockland possibly and if you would like to have the weapon add on ahead of time please say so and I will get back wiith you when I animate it.The gun has a chamber so that the bullet shell can fall out, it also has a mag/clip at the bottom. Please rate and tell me what you think. I will be posting and checking back with this topic. Ps. There will be more guns made by me. Lol any request? Hope you enjoy/ps. updated again lol.