Hi im trying my hand at 3d modeling and am not sure if this would work in real life or not
could someone with more experience tell me if this is a viable way to shoot a gun?
im trying to create truly handmade guns
Is the hole you put your gunpowder in covered when shooting? If not, no, the gunpowder will just flare up.
That’s true. Gunpowder expands as it burns. The only way for that expansion to push the bullet is when there is nowhere else for the gas to expand to. With a big hole on top of the gun, the gas will expand out that top hole and the bullet won’t move.
ahh ok so would i have to remove the hole and just put the gun powder in the barrel?
Your design will have projectiles in both ends if you remove the hole. The flint will shoot out from the back.
Google musket, flintlock, cannon etc. to see some of the most basic gun designs.
Example here:
That’s pretty much the most basic gun I can think of. A tube where you first insert the powder, then the projectile and a small hole in the end to ignite the powder.
Bolt action rifles and modern artillery isn’t that advanced either. They have a design where you open the back of the barrel (where the flint is in your case), insert the projectile and powder, and then close the back of the barrel again.
ok i removed the hole. so if i put the gun powder in and then a projectile then slam the flint in and use cloth or something on the end of the flint to block the hole it will fire out of the barrel?
I suggest you go to a firing range or some place similar and try some guns out. Specifically revolvers or some old designs if you can get your hands on them. Depending on where you live it shouldn’t be very hard or expensive to do so, and it’s great fun as well.
Because you obviously have no idea of the forces involved when firing a gun. 
A piece of cloth isn’t going to help.
Alternatively you can do some heavy googling. There’s tons of videos on Youtube as well.
The ideal barrel is completely solid and air tight everywhere except out the business end (where the projectile comes out) so that all the expanding gases help push the projectile out the barrel. This isn’t practical because you need to some way to ignite the powder. That’s why old cannons have tiny holes for the fuses or modern guns have firing pins. These are all openings in the barrel that ideally wouldn’t be there if you could ignite the powder telepathically so to speak But these holes and opening are made as small as possible, and everything involved is as heavy and solid as it needs to be to stop the expanding gases from exiting the wrong way. Just look at how massive the bolt of a bolt action rifle is and how securely it is fastened. Or the breech of a cannon. It’s not a piece of cloth.
Alternatively you can go the route of any modern game out there. Make it look cool rather than realistic. The majority of gamers won’t care.
Edit:
Here you get an idea of the size and mass of the breech on a howitzer and you can see that on this particular howitzer they close it and then twist it like a screw to seal it:
https://en.wikipedia.org/wiki/Breech-loading_weapon
The design you’re showing here sounds a lot like a flintlock. You can see an animation of a flintlock here:
https://www.youtube.com/watch?v=6LiCUUUWuFw
As you can see the hole in the barrel is as small as possible. Just big enough for the flint to ignite the powder inside the barrel, and small enough not to allow too much gas to escape.
awesome that video helped alot. sadly i dont think i can get to a shooting range as i live in Scotland and to do so need a license which is something i might look into as it does sound rather fun
Hey PvtGreg.
Are you thinking about printing a gun?
Not sure about the laws in Scotland, but in the US it is against the law to 3D print a working gun.
Probably not a good idea, if thats why you were asking about the functionality.
na not printing it i was attempting to 3d model proper homemade guns and needed to know how they worked