It's nice to see a dedicated thread just for steampunk
style firearms here.
Good idea. This way if someone doesn't like real firearms, they just avoid this
thread with no ensuing arguments. Kudos to admin for creating this dedicated thread.
I've built steampunk looking real firearms previously as this kit I've created to turn a standard
Ruger 10/22 into a
CRANKFIRED gun (Like an antique Gatling gun) below that in
just a few seconds converts from an air cooled version to a truly water cooled
version. Sorry but the kit is not ready for market yet. I'm still fiddling with my third prototype,
but everything on it is working just fine, just building the various interchangeable sights and not
quite finished with them yet.....










But I've got some design concepts in mind for turning antique, non classified as firearms
under the U.S. Federal National Firearms Act (N.F.A.), MUZZLELOADING antique weapons into
either semi-automatic or even fully automatic.
By being MUZZLELOADING they are
NOT classified under Federal law as
"FIREARMS".
They are totally unregulated under U.S. Federal law. Most state laws mirror Federal law, and only a
small handful of states are more restrictive on muzzleloading weapons than Federal law is.
So one still has to check their specific state law as to the legality of building or owning any
of my semi-auto or full auto muzzleloading concepts. But concerning U.S. Federal law since they
are muzzleloaders....they are okay.
Here's a concept of mine that uses the Webley Fosbery zig zag cylinder in a muzzleloading revolver
that would make that revolver semi-automatic. I used a Ruger Old Army frame for the mockup, but
can easily transfer the concept to an 1858 Remington frame. I am seeking an old beater 1858
Remington to test my design on. Here's my concept mockup pics.....
Next below two photos are my concept for a semi-auto MUZZLELOADING revolver. I think Jules Verne's Captain Nemo would love it.
A "Hellboy" character set in Victorian times would like it too. Only his would have to be scaled up
to .68 caliber and fire explosive projectiles

. But seriously....that could be done.
In my concept the cylinder would recoil rearward while a
fixed lug on the frame followed the zig zag slots.
Which upon the cylinder recoiling rearward would turn the cylinder halfway to the next chamber and cause the hammer to recock.
Then as the recoil spring decompresses and pushes the cylinder back forward again, the fixed lug on the frame following the zig zag
slots would finish turning the cylinder the other half way so that the next chamber is now in line with the barrel and ready to fire.
Just like the antique Webley Fosbery semi-automatic cartridge revolver works. Only this would not use cartridges and would be a muzzleloading weapon and as such classified as a NON firearm under U.S. federal law.
The internal lockwork would have to be slightly modified so that the hammer when it is re-cocked by the recoil forces,
would stay cocked until you released tension on the trigger (after the first shot) and then functioned it again.
Because as the revolver is without modification, if the trigger were held down, the hammer would not stay to the rear when
it was pushed back, but would follow the cylinder forward and that would either make it go full auto or else not work at all because
there might possibly not be enough force to pop the percussion cap. Since the muzzleloading revolver only has
six chambers in its cylinder, making it full auto wouldn't make much sense because the burst would be very short.
So although making it full auto is possible mechanically....I'd keep this six shot muzzleloading revolver concept semi-auto only and leave the full auto concept for the much higher possible shot capacity of my harmonica gun concept.

....and the same concept but with a longer frame and longer cylinder......

I also have some design concepts for a steampunk harmonica rifle that is based somewhat on the
Jonathan Browning harmonica rifles and also the Captain Nemo harmonica rifles seen in the
"Mysterious Island 2005" made for t.v. movie, as in these still pics I took from the movie.....
Firing the muzzleloading Captain Nemo harmonica rifle.

Turning the trigger guard/crank handle that
supposedly advances the harmonica block to the next
muzzleloaded chamber for the next shot. But after watching the video clip I made of it multiple times, I
found that it did NOT advance the harmonica block to the next chamber when the crank was rotated.
Which makes me believe this was not a real operating harmonica rifle, but possibly a real but single shot
weapon made up to look like a repeating harmonica rifle. Or....it was a non firing movie prop and they put
the smoke and flash from it by using computer graphics. At any rate, whichever it is, the harmonica block
did NOT advance when he rotated that trigger/guard crank handle. And you can see that in the short video
in my link to the thread I wrote about this that I've included further down this post.

Side and from the front view of the Captain Nemo harmonica rifle. (I've studied these extensively as you
can see and read in my thread that I posted the link for further below).

Only I would make the harmonica block that includes
the chambers much longer so it holds a much higher capacity. Something like 100 muzzleloaded rounds
and I would mount it on a tripod. Remember, being a MUZZLELOADING weapon, it is exempt from
Federal regulation and could be made semi-automatic or fully automatic.
These are my latest crude renderings of my ideas on that.....
Gas operated, either semi-auto or full auto version. Similar to the Captain Nemo harmonica rifle, but my concept modified
to gas operation instead of being manually operated to advance the harmonica block like the movie gun
SUPPOSEDLY did,
(but in reality did not).
I would use a linear rack gear on the full length of the harmonica block that was advanced by a round gear that was activated by the gas piston which is activated by gas tapped from the barrel into a cylinder that the piston rides in. The linear (straight) rack gear with the round gear turning it to advance the harmonica block to the next cylinder for the next shot, would be similar to a rack and pinion system on a car's steering.
I would also use pyrodex plus p, which is a black powder substitute that does not foul and gum things up like standard black powder will. Also I would support the hi capacity harmonica block via a rolling conveyor system so it would not have undue cantilevered weight upon the receiver of the gun.
Remember....it's a
muzzleloaded harmonica block, and so was the Captain Nemo harmonica block.

Same concept, only showing it manually crank fired (like a Gatling), and with no gas piston cylinder having to be on
the barrel by virtue of it being manually crank fired operated instead of gas operated, I can put a water jacket on it
for cooling the barrel.

I'm going to build the semi-auto muzzleloading revolver first, then work on building the tripod mounted
harmonica block fed gun after that.
If you are interested in these types of muzzleloading rapid fire weapons,
(being MUZZLELOADERS they are not classified as "Firearms" under U.S. Federal law and are thus exempt from Federal regulation)
you can read more about their history, my ideas, concepts and designs for making them semi-auto or full auto, at the below link to another thread I've written about them. Lots of pics there and even some short videos I captured and cropped from the "Mysterious Island 2005" movie showing how the Captain Nemo harmonica rifles advanced their harmonica block to the next chamber for firing. I did an extensive search and no still pictures nor anything about how these Captain Nemo movie harmonica rifles operated was available online....until I took the still photos of them and made a cropped video of them in operation, and figured out how they SUPPOSEDLY were supposed to work.
No one had ever done that before.
I'll post more when I get my design for the muzzleloading zig zag slots cylinder muzzleloading revolver built.
Here's that link to my thread on this. I think you'll enjoy reading it and learning about some Victorian rapid fire weapons and how my concepts can make them semi-auto or even full auto......
http://thefiringline.com/forums/showthread.php?t=460489 Hope you enjoy reading my above link.
.